(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

The expression nC5/nC4 can be simplified to:

2. Relevant equations

I'm assuming that I'm to use n!/(n-r)!r!

3. The attempt at a solution

I attempted to do this:

n!/(n-5)!5! / n!/(n-4)!4!

n!/(n-5)!5! x (n-4)!4!/n!

1/(n-5)!5! x (n-4)!4!

And I'm stuck after this point. The possible answers are:

A. 1/5(n-5)

B. (n-4)/5

C. 5(n-5)

D. none of the above.

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Math 20: Perms & Combs Help.

**Physics Forums | Science Articles, Homework Help, Discussion**