Question

$\frac{8!}{3!*5!} - \frac{9!}{2!*7!}$

puteti explica in detalii ?

Answer 1

8!/3!*5! - 9!/2!*7! =

= 5!*6*7*8/3!*5! - 7!*8*9/2!*7!

simplificam

= 7*8 - 4*9

= 56 - 36

= 20

Answer 2

Răspuns:

8!/3!*5!=5!*6*7*8/1*2*3*5!=6*7*8/6=7*8=56

9!/2!*7!=7!*8*9/1*2*7!=8*9/2=72/2=36

56-36=20

Explicație pas cu pas: