Combinations NEED HELP

Question

In how many ways can a committee of 5 people be chosen from a group of 15 people?

Answer 1

There's a formula for the number of combinations of n elements taken r at a time. You should look it up in your textbook (or other learning material). It's

_nC_r = (n!) / [ (n-r)! * r! ]

Just plug in the numbers and do the arithmetic.

Answer 2

it is C5/15, so it is 15*14*13*12*11/5*4*3*2*1=3003