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# help

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

Mar 31, 2019

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

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