Question

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

Answer 1

Resposta:

[n!+(n-1)!]/(n-2)!

[n*(n-1)(n-2)! +(n-1)(n-2)!]/(n-2)!

n*(n-1) +(n-1)

= (n-1) *(n+n-1) =(n-1) * (2n-1)

Answer 2

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

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

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

n(n-1) + (n-1)

n²-n +n-1

n² -1