Question

Me ajuda com essa questão pra agora

4- Se (n+1)! = 10n!, então (n-1) x 2: *

6
7
10
16
N.D.A

Answer 1

$\mathsf{(n+1)!=10n!}\\\mathsf{(n+1).n!=10n!}\\\mathsf{n+1=10}\\\mathsf{n=10-1}\\\mathsf{n=9}$

$\mathsf{(n-1).2=(9-1).2=8.2=16}$

Answer 2

(n+1)! = 10n!

(n+1).n! = 10n!

(n+1) = 10

n= 9

(n-1) x 2 = (9-1)×2 = (8) ×2 = 16 ✓