+0  
 
0
165
1
avatar

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

 Mar 31, 2019
 #1
avatar+107006 
+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.

 Mar 31, 2019

22 Online Users