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.