Question

Alguem faz essas contas

Answer 1

Resposta:

a)

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

b)

$\frac{(k+3)!}{(k+2)!} =\frac{(k+3)(k+2)!}{(k+2)!} =k+3$

c)

$\frac{12!}{14!} =\frac{12!}{14*13*12!} =\frac{1}{14*13} =\frac{1}{182}$

Valeu!