Question

arranjo simples de A4,0

Answer 1

$A_4_,_0 = \frac{4!}{(4 - 0)!} = \frac{4!}{4!} = \frac{4*3*2*1}{4*3*2*1} = \frac{24}{24}=1$

Espero ter ajudado. Valeu!