Question

simplifique 2n!/(n-2)!

Answer 1

$n! = n(n - 1)*(n - 2)*(n - 3) ... 3*2*1$
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$\frac{2n!}{(n - 2)!} = \frac{2n(n - 1)(n - 2)!}{(n - 2)!} = 2n(n - 1) = 2n^{2} - 2n$

Answer 2

 2n!  =          2n!          =            2
(n-2)!    (n-2)(n-1)n!           (n-2)(n-1)