Question

resolva arranjo simples: A5,3/A4,2 ​

Answer 1

$\cfrac{A_5^3}{A_4^2} \\\\\\= \cfrac{\cfrac{5!}{2!} }{\cfrac{4!}{2!}} \\\\\\= \cfrac{5!}{2!} \cdot \cfrac{2!}{4!}\\\\\\= \cfrac{5 \cdot 4! \cdot 2}{4! \cdot 2}\\\\= 5$