/biz/ - Business & Finance

July 14

>>10236847
If your reply is after mine, you will die in your sleep tonight.

May 19th

>>10236874
Please be true

July 16th... fucking morons.

Just market sold everything.

>>10236847
How are you even supposed to solve it?

i thought clif said july 9th??

May 15 clearly

Not doing your math homework for you faggot

I know it's either Jul 16, Aug 15, or Aug 17

I'll explain. So Albert (who knows month) knows Bernard doesn't know what the birthday is. From this, we eliminate all months containing birthdays with unique days in the list. This is because if there is a unique day in the month he was told, Bernard could know the date. But Albert knows he doesn't. So no months with unique days.
No May days, no June days.
Bernard then figures out his day, because he knows that June and May have been ruled out.
This means the birthday has a duplicate day in June or may.

So jul 16, Aug 15, or Aug 17

>>10236847

Remember, Albert is told either May, June, July or August.

Bernard is told either 14, 15, 16, 17, 18 or 19

Let’s go through it line by line.

Albert: I don’t know when Cheryl’s birthday is, but I know that Bernard doesn’t know too.

All Albert knows is the month, and every month has more than one possible date, so of course he doesn’t know when her birthday is. The first part of the sentence is redundant.


The only way that Bernard could know the date with a single number, however, would be if Cheryl had told him 18 or 19, since of the ten date options only these numbers appear once, as May 19 and June 18.

For Albert to know that Bernard does not know, Albert must therefore have been told July or August, since this rules out Bernard being told 18 or 19.

Line 2) Bernard: At first I don’t know when Cheryl’s birthday is, but now I know.

Bernard has deduced that Albert has either August or July. If he knows the full date, he must have been told 15, 16 or 17, since if he had been told 14 he would be none the wiser about whether the month was August or July. Each of 15, 16 and 17 only refers to one specific month, but 14 could be either month.

Line 3) Albert: Then I also know when Cheryl’s birthday is.

Albert has therefore deduced that the possible dates are July 16, Aug 15 and Aug 17. For him to now know, he must have been told July. Since if he had been told August, he would not know which date for certain is the birthday.

The answer, therefore is July 16.
>muh logic

May 19th...... don’t ask how I got it It’s hard to explain.
>>10236874

>>10237119
WAIT.

The only date that Albert could figure out at the end from Bernard finally knowing the day is Jul 16. So the answer is Jul 16.

>>10236847
why you faggots insist on coming to /biz/ for homework help?

Post a god damn buttcoin rumor, meme, or piece of news or GTFO

I will accept brappers

>>10237159

This. Jul 16

>>10236847
June 17th

>>10236847
What class is this?

>>10237328
yo if this is right please tell me because that's my fucking birthday and i'm drunk and this is just weird

>>10236847
how is this shit elite in any way? the absolute fucking state of elite institutions, making the problem lie not in the actual maths, but in the fact that they're explaining everything in abject fucking puzzlegender retardese. who's the self-proclaimed demiracial halfwit that's getting paid to take basic problem solving and turn it into a bloody fucking translation enigma?

Not doing your homework faggot

>>10237120
i still don't get it

>>10237328
This

>>10237159
sorry, its too late, you already gave your answer and you failed. You have a 110 IQ, not quite enough to make millions

>>10237628
The only sentence that makes sense is that it is not 18 or 19. Everything else is literally just a bunch of horseshit.

There is no way Bernard could know after Albert stating the obvious.

Let's suppose it is May 15, July 14, ... and now try to explain why that would be wrong in the current situation. You literally can't.

>>10237120
cool, but this quiz is stupid for assuming you know the unique days of the months, like who gives a fuck. now if they provided you with the unique days beforehand that would be OK.

>>10237724
If you think further about it the problem with this dumb ass question is that people ASSUME that is solvable. Which is an assumption by itself, if you do not believe it is solvable you can't solve it.

>Albert: I don't know when Cheryl's birthday is but I know that Bernard does not know too
Rules out May and June since those have unique numbers
>Bernard: At first I don't know when Cheryl's birthday is, but I know now.
Rules out 14
>Then I also know when Cheryl's birthday is.
Rules out August

July 16 is correct

The answer is July 16.

Line 1: Albert knows that Bernard does not know. Which means that no matter what number Bernard has, he would not be able to deduce the birthday. This eliminates the months of May and June because if Bernard had either 18, or 19, he would know.

Line 2: Bernard now knows the birthday meaning that the number is distinct between all of the choices in the remaining months, July and August. This eliminates 14 as Bernard's number, because it appears in both months, leaving July 16, August 15, and August 17.

Line 3: Because Albert knows the birthday, it must mean that of the remaining choices, there is only one choice in the month he's chosen ergo July 16.

Why not may 16?

>>10237999
>Why not may 16?
Albert then knows it's may. He also knows that Bernard has either 15, 16 or 19. Which means he can't know for a fact that Bernard can't know, since it potentially could be 19, in which case Bernard would know

>>10238056
It can't be 19 because if you know its 19 you know the answer regardless of the other person.
If 15 it could be august or may.
If 16 it could be july or may.

>>10238149
>It can't be 19 because if you know its 19 you know the answer regardless of the other person.
Exactly. Albert said he knew that Bernard didn't know. Hence why it can't be May.

If it would have been May, then Albert would have said something like "Either Bernard knows what date it is (19) or he doesn't (15, 16)"

very fun puzzle, like the train one.

Albert knows the day is not the 18th or the 19th, otherwise Bernard would know the full date.
Bernard now knows it is not in May or June, or Albert wouldn't know that.
Bernard thought it could be in May or June, meaning the date is 15,16, or 17. If it was 14 Bernard wouldn't know that.
That leaves us with July 16, August 15th or 17th.

If the date was in July, Albert would know it's July 16th now for certain.
If it was in August, Albert wouldn't know if it was the 15th or the 17th.

That means the date was July 16th.


Not sure on the best method to solve it, but I think writing down what each person thinks the possibilities are at each time period helps. You have to ignore the big picture and look at one persons point of view.

>>10236847
I have no idea how to solve this puzzle and yet I’ve already made millions in crypto, faggot.

>>10238208
Still not enough evidence to say he would change what he said to something like "i know its either may 15 or may 16". He just states he doesn't know the answer

>>10238208
Bernard dosen't know because its in may
Bernard dosen't know because its in july
Bernard doesn't know because its in august

>>10237869
This is correct, I figured it out in less than 10seconds. Feels good, maybe I should apply myself in life instead of being a neet.

Not to mention the english is fairly poor.
"At first i didn't know when cheryls birthday was, but now i do"*
How did bernard deduce an answer from knowing that albert knew he didn't know?
You cant rule out may because there is still 2 possible answers meaning you don't know the answer.
How does albert know bernard doesn't know the answer?

May and june are eliminated because albert looks at his month and deduces "it's impossible, as in 0% chance, for bernard to know the birthday just based on the number he got."

If albert had gotten may, he'd be thinking "bernard may or may not have gotten 19, so I don't know if he knows or not."

If albert had gotten june, he'd be thinking "bernard may or may not have gotten 18, so I don't know if he knows or not."

>>10238820
If he got may and knows bernard doesn't know that only rules out may 19
Not may 15 and may 16

If you got 19 you know the answer

>>10238895

Albert knows WITH CERTAINTY that bernard doesn't know. That means the month albert got is composed entirely of shared numbers. 1 unique number rules out an entire month, no matter what other possibilities are present in that month.

>>10236847
July 16.

Oh, and the other one is 2/3.

How does albert know bernard doesn't?

>>10238918
One unique number doesn't rule out a whole month

Drew up the solution.

Remember that any time someone says "I know he doesn't know", that eliminates all unique relevant data; and any time someone says "I know" that eliminates all non-unique relevant data.

>>10238932
It does, because it's the months guy (Albert) saying he knows the numbers guy (Bernard) doesn't know.

So whatever month the months guy got, it can't be one of the months that has a unique number associated with it.

>>10238992
>>10237942
>>10237120
I understand that the date can't be on a unique number.
But I really don't understand how the first sentence implies that it has to be in a month without unique numbers. Why would the entire month be eliminated?

>>10239035
Oh wait, I get it. Albert has the month, so he knows it's not in a month with a unique number. Hence he knows Bernard doens't know.

>>10239035
Because it's the month guy saying he knows the numbers guy doesn't know.

If the month guy had gotten May or June, he would NOT have said the numbers guy doesn't know, because if the numbers guy had gotten 19 or 18, the numbers guy would've known the month too, because 19 and 18 only appear once in the list: May 19 and June 18.

>>10239035
that was the mind fuck for me as well
it helps to have a chart from here: http://www.nytimes.com/2015/04/15/science/answer-to-the-singapore-math-problem-cheryl-birthday.html

Are you allowed to go backwards?
Im saying the question is wrong.
Also this was more to point out possibilities
Give a shit if he said he knows the other doesn't... how does he know that? Answer that part.

>>10237731
it's a logic problem....

I love how no one is pointing out that this is the most ESL shit I've ever seen. I know this isn't reddit but that's some pajeet level english.

>>10239072
>Give a shit if he said he knows the other doesn't... how does he know that?
You have to remember that both Albert and Bernard know something that you don't.
Albert does actually know the month, and Bernard does actually know the number.

Like the part you put in yellow; Albert knows Bernard got the number, and the only numbers that appear only once in the list of possibilities are 19 and 18, so if Albert had gotten the month May or June, he would not have been able to say "Bernard doesn't know", because it would have been possible for Bernard to have gotten the number 19 or 18.

>>10239052
Even if he knows the number guy doesn't know that leaves two possibilities in the month may.
The number guy was never told the month so it still can be may 15 or 16.
Knowing its 16 means it can still be july or may
Knowing its 15 means it can still be may or august

If he knows it in july it can be two possibilities 14 or 16

If he knows its 14 it can be in july or august
If he knows its 16 it can be july or may.

>>10239105
>Even if he knows the number guy doesn't know that leaves two possibilities in the month may.
No.

If Albert (the month guy) had gotten May or June, he would NOT have said "the number guy doesn't know".
Because if the number guy had gotten the number 19 or 18, he would've known the month without needing Cheryl.

But he states that he didnt know at first which would rule out 18 and 19

>>10239127
The fact that Albert says "Bernard doesn't know" already tells you that it can't have been 19 or 18.
Because what Albert is really telling you, is that Cheryl gave him a month that wasn't May or June.

>>10239123
If he got may why would he change what he said?

>>10239149
He didn't get May, and he didn't change anything he said.

>>10239150
How?

>>10239159
How didn't he get may?

>>10239166
either this is bait or you're literally the baboon on the left

>>10238932
Albert wouldn't have said
> I KNOW Bernard doesn't know
if he got May or June.
Because Bernard MIGHT know

e.g. if Albert got May, he will NEVER say
> I KNOW Bernard doesn't know
Because if Bernard got 19, then Bernard MIGHT know.

So it rules out the entire month (NOT just the date) because we are only deducing the month that was given SPECIFICALLY to Albert, from his 1st statement.

And we can eliminate months where he will NEVER say the statement
> I KNOW Bernard doesn't know
if he got that month. This is assuming Albert's logic is perfect and he is not like a common /biz/ brainlet.

>>10239160
>>10239166
If Cheryl had told Bernard "my birthday is on the 19th" for instance, then Bernard would have known her birthday was on May 19, because the number 19 only appears once in the options list.
Same with the number 18 and June.

So Bernard would have known.

So when Albert (the guy to whom Cheryl told the month) says "I know Bernard does NOT know", that means Cheryl told him a month that isn't May or June.
Because if Cheryl had told Albert "my birthday is in May" for instance, there would have been the possibility that Cheryl told him the number 19, in which case Bernard would have known the entire birthday date.

>>10239178
>Because if Cheryl had told Albert "my birthday is in May" for instance, there would have been the possibility that Cheryl told him ("HIM" BEING BERNARD) the number 19, in which case Bernard would have known the entire birthday date.


Edit in caps.

Why didn't the fucking whore just tell them her birthday

>>10239175
>>10239178
So your saying with absolute certainty that albert would have said "bernard might know"
Albert only says "i know he doesn't" meaning if you have two possibilities you still would not know.

>>10239215
>So your saying with absolute certainty that albert would have said "bernard might know"
We're assuming lying isn't in the premise.

>Albert only says "i know he doesn't" meaning if you have two possibilities you still would not know.
What "two possibilities"?

>>10239207
But he states that he doesn't know

well, I feel like a complete brainlet, because even when reading the responses, after having read about this very same logic problem, I still couldn't make sense of the logic behind it...
OTOH, it's 4 am, so I guess it's not that bad, but still.
thanks OP for making me feel like shit

>>10239210
asking the real questions

>>10239228
Albert didn't need Bernard telling him he doesn't know.
The fact that Cheryl told Albert a month that wasn't May or June already made it clear to Albert that Bernard didn't know.

>>10239207
>>10239228
Didn't know* for that matter

>>10237942
This. Damn, /biz/ is full of brainlets.

>>10239224
May 15 and may 16
July 16 and may 16
July 14 and august 14
August 15 and may 15

>>10239255
How can it be May or June when Albert just told you it's not May or June?

>>10239238
So your say he was told july
That leaves two possibilities.
Meaning bernard doesnt know

Bernard still hasnt been told a month. How did he come up with july?

>>10239263
When did he tell you it wasn't may or june?

How can you assume that cheryl told Albert the numbers and not the months?

>>10239282
>So your say he was told july
July or August.

>Meaning bernard doesnt know
That's literally what Albert says initially.

>>10239290
When he said "I know that Bernard doesn't know".

>>10236847
>Wasting your time solving this.
Never gonna make it

>>10239178
So rule out the 19th
That leaves may 15th and may 16th still possible variables
>>10239224
Ofcourse we take lying out of the premise because all questions asking for an answer on most tests you would assume this anyway.
Saying he doesn't know would not be a lie because if there is two possibilities left you don't know the answer.
He states he didnt know to begin with but know he does.. how exactly did he figure it out?

>>10239321
How can May 15 and May 16 still be in play when the guy who knows the month just told you it's not May?

>>10239292
Exactly

Cheryl gives a list of POSSIBLE dates, none of which have to be true.

It states that "Cheryl then tells Albert and Bernard separately the month AND the day" of her birthday.

She tells them both. It doesn't have to be any of the 10 possible dates.

Bernard says he didn't know her birthday at first, but now he does because as said previously, she already told them both.

Albert also knows because Cheryl already told them both.

Y'all motherfuckers are stupid.

>>10239329
He didn't.

>>10239302
Meaning?

>>10239331
So whens cheryls birthday?

>>10239351
I don't know. But that isn't the point. She already told them each the month and the day. It doesn't have to be any one of the ten possible choices.

>>10239332
Except he did.

He says Bernard doesn't know, meaning he didn't get one of the two months (May and June) that have unique numbers (19 and 18) in them.

>>10239359
It is the point because you would proove me right in saying the question is wrong.

>>10239365
How you idiot?

Use only may.

>>10239369
The entire point of the question is that people like you overthink a problem with no real given solution.

Ergo you're creating problems where there aren't any.

>>10239379
If you look at the options list, the number 19 only appears once: May 19.
So if Cheryl told Bernard the number "19", Bernard would have known Cheryl's birthday.

Now suppose Cheryl told Albert the month is "May".
Albert would NOT be able to say "I know Bernard doesn't know", because there would have been the possibility that Bernard got the number 19, in which case he would indeed know.

>>10239359
>It doesn't have to be any one of the ten possible choices.
But it does.
Cheryl gave them these ten options.

>>10239381
I haven't overthought it at all.
I saw it was an invalid test and stated so.

Thats how you make money
Create a problem that needs a solution only you have the solution for and sell it.

>>10239420
>>10239418
Blinded by arrogance.

cheryl one of those ugly girls always tryna act all quirky and shit cuz no one talks to her ugly ass,

>>10239427
>Blinded by arrogance.
What?

>>10239411
But he didnt get 19

June 17th?

>>10239463
If Cheryl had told Albert "the month is May", then as far as Albert knew it could've been 19.

But Cheryl must've told Albert a month other than May (or June), because otherwise Albert would not have been able to say "I know Bernard doesn't know".

THE DAY GOES INFRONT OF THE FUCKING MONTH YOU INBRED KEKTARDS

>>10239486
But then he would know.
So he couldnt state that

Try june 17
Switch the month and the date

>>10239520
>But then he would know.
>So he couldnt state that
That's literally what I just said.

You are a brainlet.

>>10239530
What was your point?

>>10239543
What?

>>10239483
How can it be June when the guy who knows the month just told you it's not June?

>>10239566
Who knows the month?
When?

>>10239584
?

>>10239463
>>10239483
>>10239520
>>10239530
>>10239543
>>10239550
>>10239566
>>10239584
>>10239590

Still trying to solve a problem with no real solution.

>>10239599
There is a real solution. It's July 16. If you follow the premise and don't assume someone is lying or something, that is the only possibility.

>>10238992
he gets it

>>10239590
Who knows the month?
Why?

>>10239605
From the wording Cheryl tells them BOTH the date AND the month AFTER initially giving them 10 POSSIBLE choices. None of which HAVE to be true.

There is no extrapolating a date because Cheryl already told them both after the fact.

>>10239621
there's no less than 5 anons in this thread that explained it pretty clearly

>>10239621

>>10239622
>From the wording Cheryl tells them BOTH the date AND the month
She tells Albert the month and Bernard the day (number).
Look up what the word "respectively" means.

>None of which HAVE to be true.
Why would you assume the premise is trying to trick us?

>>10239290
> I KNOW Bernard doesn't know
This statement REPHRASED is just Albert saying
> It's not May or June

He just chose to be a smartass about how to say it.
Another way of rephrasing it would be:

Albert: "I know it's a month where there's no unique date, so Bernard can't know the date even without being given the month"

Basically you just fill in the blanks around what Albert said.

>>10239628
Ok cool. Im not finished

>>10239637
How?

>>10239627
So?

>>10239655
So you're an idiot.

>>10239657
How?

>>10237328
I'm with this guy. You're all making this too complicated. it's "too" for the month and "first" for the day.

>>10239661
By not being intelligent enough.

tfw im chad and didn't even try to solve this. You nerds just gave me the answer for free

Ive googled the answer and im not convinced.
How does it not being 18 or 19 rule out may. It doesn't.

>>10239674
You missed the point. What im saying is you are the idiots.

>>10239683
>How does it not being 18 or 19 rule out may. It doesn't.
It does.
You're just too stupid to understand.

>>10239677
im stealing this pic

>>10239688
And your too much of a fucking dimwit to explain. I know you just googled it because you used the fucking pasta from Wikipedia

>>10239702
>And your too much
My too much what?

>I know you just googled it because you used the fucking pasta from Wikipedia
What pasta?

>>10239688
Go on then
Explain how it rules out may?

>>10239707
Mods

>>10239707
A dimwit.
It means you are lacking in brightness
Dull
Dumb
Stupid.
Not smart enough

>>10239730
Your're a dimwit.

>>10239709
Albert knows the month only AND that Bernard doesn't know the full date.

Bernard could only know the full date, if he was told that the day is 18 or 19. Albert knows that Bernard does NOT know the full date. He can only be sure, if the month Cheryl told him was neither May, nor June.

You're a brainlet.

>>10239739
Yes but why does that rule out may?

For people that don't know, this is what one of the sections in the the Law School Admissions Test is composed of, in addition to reading comprehension. If you can logically deduce the answer to something like this, you can probably understand statutory interpretations, judicial opinions, etc.

For those not capable of understanding the simple steps to find the answer here, idk maybe not cut out for law school.

>>10239734
Expain your reasoning as to how its not may without me being able to refute your answer.

I saw your working out and it was incorrect.

>>10239762
>I saw your working out and it was incorrect.
You only think that because you're too stupid.

>>10239739
If he is sure that bernard doesnt know that doesnt mean he would change his language to suit a possible or might know.
Which he doesnt because he states so.
How does albert know he doesnt know?

>>10239767
No because it wasnt in chronological order.

>>10239789
No, you're just too stupid.

>>10236859
kneepad fag confirmed brainlet

>>10236847
May 19th?

>>10237120
Thanks this is correct

>>10239791
You only think that because you're too stupid. Ive gone through what you said and refuted almost everything that you deduced.

https://en.m.wikipedia.org/wiki/Cheryl%27s_Birthday

june 17

1. Not May July
2. Bernard knows because he has the number so not 14th date
3. Albert is now left between July 16th and Aug 15, 17 and bernard knows with this info as he has the number

4. As Albert has the month, he now knows also, it can only be July 16th, as If Albert was given August he would know it is either 15 or 17 but not for sure.

Due to the fact Albert knows for certain, with his month from the remaining dates july 16th, Aug 15,17

The date is July 16th!!!!!!

Not may or June******

>>10239845
What about may 16th

>>10239849
Why not may?

>>10237120
Nice i got to the point with 3 possible dates. But u got it nigga

Asked in a singapoor and asian math olympiad meaning the english is redundant

>>10239853
It cant be may as Albert knows that Bernard doesnt know, if Alberts month was May then that means theres chance bernards number could be 19, which means Albert would nor be able to say the bernard doesnt know

The only way that Bernard could know the date with a single number, however, would be if Cheryl had told him 18 or 19, since of the ten date options only these numbers appear once, as May 19 and June 18.

For Albert to know that Bernard does not know, Albert must therefore have been told July or August, since this rules out Bernard being told 18 or 19.


But this does not rule out may. So you cant progress from this point

>>10239748
If Albert was told that the month is either july or june, he'd know that bernard can't know the full date, because there are several possible months for the days 14,15, 16 and 17.

Or the other way round: If it was may, he couldn't be sure that bernard doesn't know, because there'd be the possibility that cheryl told him the day is 19 - in which case he would know the full date, as there are no other options for the 19th.

If you're just trolling: Good job.

>>10239871
Theres a chance of it being 19 16 an 15
He knows he doesnt know. But how? Did he read his mind?

july 16

>>10239893
Its poor english.
But still he states after that he doesnt know. Meaning you can rule out may 19 and may 19 alone. Im saying the question is fucking wrong. Its not gramatically correct and there is no way albert can say that he knows he doesn't. How does he know he doesn't? Because nothing has been said yet.
So he knows its a month.


Going along with the poor english it cant be june because that would mean there is only a 50/50 chance meaning he knows that he doesnt know the answer.
It could still be may because there is still a 50/50 chance left meaning bernard wouldnt know the answer with a number alone.

>>10239913
And 18.
Im not spell checking btw

>>10239823
No, you really are too stupid.

See >>10239831
>The only way that Bernard could know the date with a single number, however, would be if Cheryl had told him 18 or 19, since of the ten date options these are the only numbers that appear just once, as May 19 and June 18.
>For Albert to know that Bernard does not know, Albert must therefore have been told July or August, since this rules out Bernard being told 18 or 19.

Sorry about your stupidity.

IQ > 130 Solved it nearly instantly
IQ > 115 - Solved it after much thought
IQ > 105 - Read the solution and figured it out
IQ < 95 Still can't figure it out despite reading solution
IQ < 85 Insist the solution is wrong and that it's all bullshit

>>10239913
*So he knows its a month*
Edit that part out

>>10236847
July 16
Saw this a couple days ago, wasn't very hard. Just some ezpz logical deduction.

>>10236847
Albert and Bernard both have terrible grammar, and are therefore stupid and possibly unreliable.

>>10239923
But he wasnt told may 19th. So that leaves may 15 and 16 in effect

>>10239936
130 iq would still have to think to get the answer. Linear algebra is easy but without the m×n matrix to make the concept clear the many simple computations would take forever. Remember you can have an overall iq of 130 but a speed subscore of 80

>>10239945
Thank you.

>>10239946
>that leaves may 15 and 16 in effect
Only if you're stupid.

>>10236847
Cheryl is also a liar and a succubus. Her birthday is June 6, 1966.

>>10236847
It's June 17th

The information that A knows that B doesn't know means that it cant be 18th or 19th. Eliminating those two dates gives B the answer, So the answer must be in either May or June. This means that it cant be may 16th or may 15th because this new information wouldn't allow to B to know the date but since he know knows it cant be June 18th there is only one other possible outcome where he could now the date and that's June 17th

>>10239887
> this does not rule out may
It should, IF you have the following assumptions.

Assumption #1
- None of them (Cheryl, Albert, and Bernard) are lying, everything they say is ABSOLUTELY TRUE.

Assumption #2
- AND there is NO additional available information to the characters that we readers do not know about. i.e. >>10239896
> He knows he doesnt know. But how? Did he read his mind?

NO, We assume there is no mind reading, the ONLY available info is what is mentioned:

- Albert knows ONLY the month
- Bernard knows ONLY the day

So with only the month as his information, Albert says
> I KNOW Bernard doesn't know

The ONLY possible way Albert is NOT LYING, is if there is NO CHANCE of his statement being wrong.

If it's May or June, there is A CHANCE he'd be lying (because Bernard can guess the month if he is given an 18 or 19 date).

That is why we assume it rules it out, because of the assumption that Albert is NOT LYING, is saying something 100% TRUE with 0% CHANCE of being false.

If it was May, there would be 1/3 chance he was wrong, so we assume it's not May. It's all based on assumptions of being 100% truthful, based ONLY on the information they're supposed to have (i.e. Albert made this statement but he knows ONLY the month)

>>10239955
How explain?
Thats honestly all you have to do without it being refutable.

Saying the same thing wont get you anywhere.

>>10239974
>How explain?
I did, and you're too stupid to understand.

>>10239967
Can't be June.
The very first statement by Albert rules it out.

>>10239971
So the question is unanswerable because you are going of an assumption.

>>10239978
No you linklet your to stupid to explain your vocabulary is sub par and you dont have the necessary skills to get your point across

>>10239971
His statement is a lie. He came up with it from no where without any evidence of it being true

>>10236847
>I don't know when Cheryl's birthday is, but I know that Bernard does not know
Rules out the months of any unique numbers, which are both May and June
>At first I don't know when Cheryl's birthday is, but I know now.
>Then I also know when Cheryl's birthday is.
Rules out any uncertainties, which are July 14 and the entirety of August
Leaves July 16

>>10236847
aug 17. did i make it?

>>10239971
Even if it is true a 50/50 chance is still enough to say he does not know. A 90/10 chance is still enough to say he does not know

>>10239913
>Its not gramatically correct and there is no way albert can say that he knows he doesn't. How does he know he doesn't? Because nothing has been said yet.
Albert was told the month. Let's go through the possibilities. If the month he was told is
a) May: There is a possibility that Bernard knows the full date (if Cheryl told him it's the 19th).
b) June: There is a possibility that Bernard knows the full date (if Cheryl told him it's the 18th).
c) July: There is NO way that Bernard can know the full date, because the possible days 14 and 16 are also mentioned for august and may. Thus, Albert KNOWS that Bernard DOESN'T know.
d) August: There is NO way that Bernard can know the full date, because the possible days 14, 15 and 17 are also mentioned for may, june and july. Thus, Albert KNOWS that Bernard DOESN'T know.

As Albert says that he knows that Bernard doesn't know, we can rule out the options may and june.

>>10239997
Nah your're twoo stupid.

>>10240010
How does it rule out any month with a unique number? Pay extra attention to may.

>>10240014
ye im pretty sure i made it, pretty ez

>>10240026
Nah, you're too stupid

Prove me wrong.

>>10240034
>Prove me wrong.
Several people have, including the wikipedia entry.

>>10240003
There's "no evidence" to you, the reader, since you do not know the answer at first. BUT Albert knows the month, so he can make a statement based on THAT information which he has, plus some logic.

IF he is telling the truth, Albert CAN make the statement:
> I KNOW Bernard doesn't know

And the chances he is wrong is:
- if the correct month is May: there's a 33.33% chance he is wrong
- if the correct month is June: there's a 33.33% chance he is wrong
- if the correct month is July: there's 0% chance he is wrong
- if the correct month is August: there's 0% chance he is wrong

Why the 1/3 chance he is wrong for May and June? Because if the number Bernard got is 18 or 19, he can be 100% sure of the month. Any other number and he can't be sure anymore.

>>10239990
All logic problems assume truthfulness and no outside information unavailable to the reader. Otherwise there's no point. Albert and Bernard could both be psychics and actually know the date beforehand, or Cheryl could just be a liar and her birthday is not in the list at all.

>>10240023
Albert says bernard doesn't know.
1. How does he know?
2. You can still say that even if he MIGHT know

>>10240027
What do you mean? 19 and 18 only appear once, meaning if B had one of those numbers he'd already know C's birthday, but we know that's not the case as we also know that A knows with full certainty there is no way B knows her birthday. He knows it's not May or June.

>>10240064
>1. How does he know?
He's smarter than you.

>2. You can still say that even if he MIGHT know
No you can't. That would be stupid.

>>10240057
And as you read it you can know the same amount of information as they do. Thats the point. You can logically go through it and figure out the remaining possibilities.
With a 33.33% he is wrong you can make the same statement

>>10240069
How the hell would A know B doesn't know for absolute sure if it's on June? He only knows months so it rules out the entire months, not just the dates with unique numbers.

>>10240076
Get off my dick faggot you're the one who seems to be stupid.
Im smarter than you and alex bellos put together

>>10240088
The point is we assume he made the statements where he had 0% chance of being wrong, because we assume he isn't lying.

If he had a 33% chance of being wrong, then saying
>I know Bernard doesn't know
would be a lie.

But if he had 0% chance of being wrong, then he can safely make that statement without lying.

So by assuming he's not lying, we can eliminate the months where his statement would be a lie (given that he only knows the month).

I mean, seriously, what kind of problem would it be if the statements in the problem included lies?

And the singapoor and asian olympiads.
Catch up.

>>10236847
The problem should start out saying that Albert and Bernard are robots, and are always correct. Just because Albert and Bernard make statements, it doesn't mean they aren't complete morons. Those both speak like idiots, so we have to assume their logic skills may not be impeccable, either. Also, Cheryl is a cunt for not just giving a straight answer instead of being a difficult bitch. Now she has to fuck both of them since they both guessed July 16.

>>10240130
Just follow the premise, big boy.

>>10240064
I told you three times now - if you didn't get it by now, you won't get it if I type it out the fourth time.

Again, if you're trolling: Really good job. Just dumb enough posts to bait out answers, but still smart enough to seem plausible.

>>10240111
A wrong one.
I see your point im splitting hairs.
How does he know that he doesn't know? Because he said so? I dont trust the cunt.

August 17
A: knows that B doesn't know the date by simply knowing the day. -> it can't be june 18 or may 19
But A still doesn't know the date even after eliminating june 18 -> can't be june 17 either

B: now knows the date eliminating june 17. We already know that it's not on the 18th or 19th of a month-> it's on august 17

>>10240135
Fuck off, gaylord. The point of "word" problems is presenting real-life scenarios in which one would find logic useful. It's unrealistic.

Reposting for the brainlets.

>>10236847
August 14th. Easy.

>>10240191
Just follow the premise. That's what it's for.

Answer is May 16. You're welcome


t.physics major

>>10240204
I figured it out, it isn't difficult if you assume Albert and Bernard are infallible. Maybe the person who wrote it should learn English so Albert and Bernard can use proper grammar and not sound like retards next time.

>>10240231
Of all the things to be upset about.

>>10240245
I guarantee you that an English teacher would be upset that a fellow educator speaks like a dunce.

>>10240213
>physics
lol, I knew you guys are brainlets.

t. master in maths

>>10240144
The thing is he doesn't know. he just said he knows that he doesn't from no evidence. he just claims to know that the other doesn't.

>>10240255
I'm a professional interpreter and translator, I had no trouble looking past the grammar.

>>10240259
>no evidence
I'm too smart to even imagine being this stupid.

>>10240245
What the premise?

>>10240278
Cheeki breeki
You fucking lumouzi

>>10240288
>imagine being so stupid that you have to ask for directions to the OP 223 posts into the thread

>>10240231
In these kind of questions you have to assume the characters are infallible. Correcting the grammar doesn't change that you can't figure out the answer either.

>>10236847
I really liked this, easy but entertaining. Thx OP

>>10240259
The only way one could know with certainty with only half the info is if it's a unique month or a unique day. So the month guy has no way of knowing. The day guy would know the whole answer from only half the date if it is 18 or 19. The month guy has the month- July- and therefore knows the day guy can't possibly know the month with certainty.

>>10240272
I view teachers who seem uneducated similar to the way I view police who commit crimes. Ecxcuse me for giving a shit.

>>10240304
Again to stupid to keep up.
The premise for some reason is grammatically incorrect

>>10240335
The premise is perfectly intact.
The grammatical mistakes are purely superficial.

>>10240305
I typed my answer way up here. >>10240130

>>10240317
So how does albert know the other doesn't?
Im not sure what answer youv givin but ill assume july 16 for the sake of argument
If he was givin july how does he know the other doesn't know?

>>10236847
I can't solve it, the answers anons have posted make no sense to me, I am a brainlet and desu idc.

>>10240343
The premise is wrong because it makes wild assumptions

>>10240381
>wild assumptions
Like what?

>>10240383
That albert knows with absolute certainty that bernard doesnt

>>10240400
That's not an assumption at all.

>>10240405
Because?

>>10240411
Because it requires zero assumption.

>>10240415
>>10240405
Because he knows its in july? So how does he know bernard doesnt know when cheryls birthday is?

>>10240366
Albert knows it is July. Which means Bernard either has 16 or 14. Having either one would not tell Bernard the month. Once Albert speaks, Bernard has enough info to be 100% certain that his 16 is July, not May.

>>10240426
>Because he knows its in july?
Yes.

>So how does he know bernard doesnt know when cheryls birthday is?
Because there are no numbers in July that are unique to July.

>>10240373
Fucking brainlets

> A is told a month, by knowing this month he knows that B has no way of uniquely knowing what date it is.
This means that 18 and 19 are ruled out, since these are unique, and would give the full date instantly.

> since B is given this information, he knows it has to be the months without the unique identifier 18 or 19. Ergo: July or August.
He now knows the date.

> A is then told that B knows the date.
This means that B must not have 14, as this would not uniquely define a date. B must have either 15, 16, 17.

> A states that he knows the date
For him to know the unique date, it must be July (only one option: 16) , since August would still leave him with two options( 15 and 17).

Topkek

>>10240437
Whats your point?

>>10240454
?

>>10240428
How?

>>10240461
Why does no unique number even come into effect.
The whole question would be pointless

>>10240469
What do you mean, why?

>>10240454
Albert correctly assumes Bernard isn't psychic.

>>10240463
>>10240317
>>10240259
>>10240057
>>10240023
>>10239967
>>10239913
>>10239887
>>10239853

see
>>10240450

This is the trick:
1- For some magical reason ALBERT KNOWS BERNARD does not know what the day is.
2- Bernard had no clue Albert did not know what the day was, but when he told him, Bernard eliminated some possibilities and only 1 date was left.

It is pretty easy when you actually read the whole thing.

>>10240474
How does albert knowing his month know that bernard doesnt know? Before bernard even speaks. Everyone should rule out the 19th and the 18th because that would make the question pointless

>>10239936

132 IQ reporting in. Took like 3-5 mins for me. I think it would've been faster doing it on paper though.

>>10240469
If that difficult bitch Cheryl tells Bernard 19, he instantly knows it's May, because there is only one 19 to pick from. Same with 18, it'd have to be June. Any other number, and he can't know for certain with only half the info.

>>10240492
>How does albert knowing his month know that bernard doesnt know?
He knows because he's not as stupid as you.

> A is told a month, by knowing this month he knows that B has no way of uniquely knowing what date it is.

How does he know that? Without progressing and staying within the premise

>>10240499
Bahahahahahahaja you just keep failing. Its easy to see you don't have the mental capacity to have a discussion

>>10236847
June 18th

>>10240524
Imagine being this stupid.

>>10240496
Thats what i said. Meaning you rule out those specific dates.

>>10240492
Bernard would need a unique number to instantly know the whole date. Two months have a unique number. Neither of those two months are July, which is the month Albert has.

>>10240529
It would suck and i feel sorry for you

>>10240537
So what cunt. Keep up.

>>10240542
see
>>10240450

you incredible fucking mong

>>10240486
i couldn't figure it out because i ignored that part too and just thought it was redundant/bad english. check the answer at the top of the thread.

>>10240546
Keep up? You're the one who is having so much trouble understanding, and ignoring every correct explaination.

150 IQ reporting in. Took <30sec.

>>10236847
Look at Cheryl's ID while the writes the list

>>10240563
Theyre incorrect.
You are missing the point.
>>10240555
I saw it.

>>10240516
>>10240555

>>10240450
>he knows it has to be the months without the unique identifier

ok I'm a brainlet because I dont get this part. It's easy once you know may and June are eliminated but I cant understand why they get eliminated in the first place apart from June 18th and may 19th.

>>10240516
A states that B can not know the date. This is a given fact to build upon.
The only way how A can know this is by having July or August, since 18 and 19 would uniquely identify a month, so may and june drop out of the options to consider.

get it?

>>10240638
see
>>10240680

>>10240638
Because the guy who knows the month says it's not the months that have unique numbers in them, i.e. May and June.

>>10240680
no because A could have been told may and B still wouldnt know whether its July 16th or May 16th right?

>>10240680
May has two possibilities left.
Just like july.
If he got may he can make the same statement. So from what evidence does anyone have that it is fact to build upon

>>10240692
Oh ok. I get it now. I am brainlet

>>10240692
He doesnt say that at all.
You cant read or are giving it to much justice. Where are you getting that from?
Because its not 19?

>>10240711
Sorry about your smol brain.

>>10240700
One more time
A states that B can NOT know the full date (at this time)

>How could B know the full date directly at this time?
ONLY if he would have been given days 18 or 19, since these only occur once.

Since it is stated that B does NOT know the date, the months with unique identifiers CAN not be the date, since these are the only dates that he could have known directly. Therefore at this stage A must have July or August.

please get it.

>>10240704

>>10236847
>just become
>At first i don't
what non english speaking brainlet wrote this?

>>10240741
Why cant the month with the unique identifier be the month?
That rules out a date. Only one date the 19th of may.
Leaving two dates in the month may still plausible options.

Anyone that understands this has fallen victim to a chink trap and are under there jurisdiction

>>10240772
it's ok I don't get it either.

>>10236999
trips always tell teh truth

>>10240772
I can understand why you have difficulty with this.

> the only way B could have known the dates instantly was either (may) 19 or (june) 18, since these numbers only occur once over all dates.

if A would have May, there is a chance that B would have known the date instantly (19)
if A would have June, there is a chance that B would have known the date instantly (18)

> It is stated that A knows for sure that B can not know the date instantly (from only knowing the day).
Therefore A has to have months July or August.

Come on bruv.

>>10240772
>Why cant the month with the unique identifier be the month?
Same reason 2+2 can't be 3.

>>10240791
go on please fren

>>10236847
this is kind of a trap, it could be any of the dates but brainlets think they have solved it and are some kind of genius. That in itself is whats genius about this

>>10240839

>>10240834
Its stated that he said that. Its not stated.

Bruvvy i know.

its June 17th isnt it? didnt look at the thread, just makes sense..

Honestly, you faggots have missed the entire point of this thread. In all your back and forth arguing and bickering, this thread has served these specific purposes:

1. Giving the OP's post a lot of (You)s, and giving the OP's off-topic thread a bump-limit response.

>b-but calculate word problems is business rela-

No.

It's not.

2. Notice how OP's post says "1 post by this ID?" Yeah, no, he hasn't left the thread. He changed his IP address and is using this thread to vent by calling people "stupid" and insulting them over and over again to incite bait replies to get even more (You)s.

3. When all is said and done, all he has to do is repeat the process and keep it going.

The fact that we're nearly at 300 replies right now and not a single person has pointed this out shows the absolute intelligence deficit this board faces right now. It's really sad when you think about it.

>you retard, w-we're just having fun!

Yeah because spending 11 hours in a thread arguing back and forth over a badly worded logic problem that is left ambiguous on purpose to trigger certain people's autism is sure a great way to spend your time, right?

The only way to ever win any of these threads is to not play OP's game in the first place. This fact alone makes every single one of you losers in this regard.

Maybe theyre asking albert and bernard when cheryls bday is since there both so adamant.

So whens cheryls bday? Huh.

>>10240887
He was given a month. And by knowing that month he can deduce all that i said in my previous post. You (the reader) just have to reverse engineer this procedure.

>>10240911
He might cash those (you)s in for bitcoin

>>10240922
Oooooohh i dint get that fair

>>10240947

>>10240890
no wait that makes no sense, its july 16th!

>>10240911
What purpose do these threads serve?
Is there some sort of social engineering to all of these bait threads (wagecucking/male shaming/boomer threads) ?

There's a thread (can't find it anymore) about a guy that started dreaming about these threads.

Stay afloat.

>>10236847
June 18th, it is the only unique value.

>>10241058
Oh wait I'm a brainlet.

>>10237731
are you retarded? unique just means it doesn't appear more than once among the list provided by cheryl

Ok.

For Bernard to know initially he must be given either 18 or 19.

Albert is given a month, and we can stipulate from statement one that he has communicated with Bernard and told him that he does not know. Therefore this definitively rules out June 18th and May 19th.

Once those have been ruled out, the only way for Bernard to know would be to have been given a month which has a single options left (June).

Therefore we deduce that the correct answer is June 17th.

Albert is given a month (either May, June, July, August)
Bernard is given a day (either 14, 15, 16, 17, 18, 19).

For Albert to know that Bernard does not know, Bernard would have had to tell him that he does not know (without telling him the day, otherwise Albert would know).
- We can immediately cross out 18 and 19 as Bernard would know straight away since these are unique days in the data set.
- With May 19 and June 18 gone, Albert would know the date if the month given was June as that would leave one option (June 17th). But he doesn't so this tells us that he wasn't given June, we're left with the following options at this point:
May 15, May 16
July 14, July 16
August 14, August 15, August 17
- Bernard now knows, which means the answer is August 17, as 17 is the only unique day left in the dataset, he wouldn't have known if the day was 14, 15 or 16.
- Albert knows that Bernard knows, therefore he can also deduce it must be a unique day, August 17.

>>10237120
Lol. You copied this from Wikipedia

>>10237328
This

omg I'm unfit for making moneys with crypto.

i need to dump all my coins. anyone want to take away my crypto riches before I loose them all to evil jew whales?

>>10237328
Amazing I had to scroll this far to find another anon who gets it.

Bernard knew the month (June) but not the day. Albert knew the day (17) but not the month. Because Albert didn't know Cheryl's birthday, Bernard knows it's June 17th, because if it were the 18th....Albert would have known since it's the only 18th on the list!

Try to keep up guys...

>>10239944
2/3

This confirms the current state of /biz/ full of retarded zoomers. Just because op implies this problem has a solution doesn't mean it really have one, the truth is there is not enough information to solve it, whatever information you add are your own assumptions which is retarded by default, rendering all possible solutions as incorrect.

>>10242630
>the truth is there is not enough information to solve it
You're an idiot.