Question

simplifique (n!)^2/(n+1)!(n-1)!

Answer 1

$\frac{(n!)^2}{(n+1)!(n-1)!}\\\\\frac{[n(n-1)!]^2}{(n+1)!(n-1)!}\\\\\frac{n^2[(n-1)!]^2}{(n+1)!(n-1)!}\\\\\frac{n^2(n-1)!}{(n+1)!}\\\\\frac{n^2(n-1)!}{(n+1)n(n-1)!}\\\\\frac{n}{(n+1)}$