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/sci/ - Science & Math

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10126081 No.10126081 [Reply] [Original]

chimneyscope!

hiiiii /sci/

2 OF people have each flipped a quarter money! we are only know one thing: at least one of them has achieved a roll of heads. the man on the left smiles and reveals his quarter.

wAT ARE THE CHANCES OF THE other unsmiling man having also a heads for his quarter?!

>> No.10126132

>>10126081
50%

>> No.10126134

>>10126081
100%

>> No.10126137

>>10126132
BUT WHAT IF

you never saw the man or who it was

you only know "at least 1 person has a heads", then
"what is the chance they both do"

then has it been 1/3?

>> No.10126187

>>10126137
they are not mutually exclusive so 50%.

>> No.10126220

>>10126137
then it's a third

>> No.10126230

>>10126220
you sure? the one is heads so it's just the probability that the other is also heads. which is 50%

>> No.10126257

>>10126230
You have three equally likely outcomes
They both have heads, guy one has heads and guy two has tails or guy one has tails and guy two has heads.
Therefore the chance of both heads is a third.

>> No.10126258 [DELETED] 

if we no at least 1 has heads and no else

does it mater if we are then revealed a person who has heads, say on the left?

>> No.10126260

>>10126257
if we no at least 1 has heads and no else

does it mater if we are then revealed a person who has heads, say on the left?

>> No.10126262

>>10126260
Yes because then it gives you the ability to determine who has heads, removing any outcomes where they don't.
This would make the probability a half.

>> No.10126663

>>10126257
yes you are right I didn't read carefully.