Question

5) simplifique.

a) n!/ (n - 1)! =
b) (n + 1)! / (n - 1)! =
c) (n + 2)!/ n! =
​

Answer 1

Explicação passo-a-passo:

$a)\\{ n!\over(n-1)!}={n.(n-1)!\over n!}= n-1\\\\ \\ b)\\ {(n+1)!\over(n-1)!}={(n+1).n.(n-1)!\over(n-1)!}=(n+1).n =n^2+n\\ \\ c)\\ {(n+2)!\over n!}={(n+2).(n+1).n!\over n!}=(n+2)(n+1)=n^2+3n+2$

Answer 2

Resposta:

desculpa fui responder e ficou desconfigurado