Question

8 fatorial 5 fatorial dividido por 4 fatorial 6 fatorial

Answer 1

$\frac{8! . 5!}{4! . 6!} \\ \\ \frac{8.7.6.5.4! . 5.4!}{4! . 6.5.4!} \\ \\ \frac{8.7.6.5.5.2(4!)}{6.5.2(4!)} = \frac{8.7.6.5.5}{6.5} \\ \\ \frac{8400}{30} =280$