Question

Resolver essa equação
N! ( n-1)! = 7

Answer 1

$\frac{n!}{(n-1)!}=7\\\\ \frac{n(n-1)!}{(n-1)!}=7\\\\ \boxed{n=7}$

Answer 2

$\dfrac{n!}{(n-1)!} =7$

$\dfrac{n.(n-1)!}{(n-1)!} =7$ → $\text{simplificar, eliminando os termos comuns numerador/denominador}$

$n=7$