/sci/ - Science & Math

>>11081694
Looking at two problems, which I am having trouble solving.

> Counting
Assumptions: Order matters, repetition allowed
University has 14-day exam period. You are writing math, physics and stat exams. How many choices of days are possible if maths exam must be held at least two days earlier than physics, and physics exam must be held at least two days earlier than stat.

Naive thought was 14x12x10, but the 'earlier' key word was the sticking point. I'm thinking math can be taken on days 1-10, physics on day 12 and stat only on day 14. Though, perhaps that is also a naive way of looking at it. Really not sure how to model the problem.

> Groups
How can you be sure that (Z_n3xZ_n3,+) has no more than 6 subgroups.
{(0,0)}
{(0,0),(1,1),(2,2)}
{(0,0),(0,1),(0,2)}
{(0,0),(1,0),(2,0)}
{(0,0),(1,2),(2,1)}
{(0,0),(1,1),(2,2),(0,1),(0,2),(1,0),(2,0),(1,2),(2,1)}

Females will never become obselete, they will be depended on for emotional security because men are weak and fragile and can't achieve stability on their own, just look at r9k where incels become faggots and traps as an easy way out

>>9700572

>muh degree is better than ur degree
I refuse to believe that you're not underage

>>9532571
>Why did God invent

>>9362630
>tfw literally skipped most of my classes and spent very little time studying but somehow still finished the semester with all A's
Holy shit my university is a joke.