What is \(\dbinom{n}{n-1}\) for any positive integer \(n\)? (Answer in terms of \(n\).)
+118608 \(\begin{pmatrix} n\\ a \end{pmatrix} = \frac{n!}{(a)!(n-a)!}\)
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.
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