Pre Calc
posted by Katie S
Simplify:
n!(n1)!

(n1)!

Reiny
( n(n1)!  (n1)! )/(n1)!
= (n1)! (n1)/(n1)!
=n1
e.g. (5!  4!)/4! , for the case n=5
= (5(4!)  4!)/4!
=4!(51)/4!
= 51
= 4
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