Question

Simplifique a expressão (n-1)!/(n-3)!

Answer 1

$\frac{(n-1)!}{(n-3)!}=\\\\ \frac{(n-1)(n-2)(n-3)!}{(n-3)!}=\\\\(n-1)(n-2)=\\n^2-2n-n+2=\\n^2-3n+2\\Feliz\ natal\ e\ um\ o\´\ timo\ ano\ novo!\\ECS.15/12/2016$