What is \(\dbinom{n}{n-1}\) for any positive integer \(n\)? (Answer in terms of \(n\).)

Guest Mar 31, 2019

#1**+1 **

\(\begin{pmatrix} n\\ a \end{pmatrix} = \frac{n!}{(a)!(n-a)!}\)

substitute n-1 for n and simplify. Then you will have your answer.

Give it a go and get back with your answer or your difficulty.

**Please no one answer over the top of me, wait for guest to give a proper response. Thanks.**

Melody Mar 31, 2019