Question

simplifique 10!7!/5!9!

Answer 1

10! .7!       =  10.9! . 7.6.5!
------------       --------------------
  5! . 9!               5! . 9!

= 10.7.6
= 10.42
= 420

Resp.: 420

Answer 2

$\frac{10!7!}{5!9!}= \frac{10.9!7.6.5!}{5!.9!} =10.7.6=420$