# gmat math

**Created:**2014-05-15

**Last Modified:**2014-05-26

_{n}C

_{k}= n! / k!(n-k)!

_{n}P

_{r}= n! / (n - r)!

- dependent if the outcome of one event affects the probability of the other event
- P(A and B) = P(A) x P(B given A)

^{2}+ b

^{2 }=

^{ }c

^{2}

^{}

^{c is the hypotenuse in any right triangle}

(n/360) · πr^2

*V*= π

*r*

^{2}

*h*

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