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

 Mar 31, 2019

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


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.

 Mar 31, 2019

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