# Math Help - simplifying an expression

1. ## simplifying an expression

I have an expression for a conditional probability with the following term:

N!/n!(N-n)!

I can't remember how to simplify this i know that it is (N choose n )*1/n! but can it be simplified further?

2. ${N\choose n}$ is ${N!\over (N-n)!n!}$

so I don't know what you're asking, why don't you state the entire problem.

3. Yes its N choose n, i got it now i was confusing myself after looking at the problem for a while