Question

Resposta da 9 e 10 por favor

Answer 1

9)

$\frac{(n - 2)i }{ni} = \frac{(n - 2)i}{n \times (n - 1) \times( n - 2)i} = \frac{1}{n \times (n - 1)} = \frac{1}{ {n}^{2} - n }$

Obs: i = fatorial

10)

8x10x7 = 560 maneiras