Question

calcule ?
me ayuda porfavor ​

Answer 1

Explicação passo-a-passo:

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

Resposta B