Question

Resolva as equações

(n+2)!
--------- =12
n!

(n-2)! 1
-------=--
(n-1)! 5

Me ajudem, pf

Answer 1

(n + 2)!/n! = 12
(n + 2)(n + 1)n!/n! = 12
(n + 2)/(n + 1) = 12
n + 2 = 12n + 1
- 11n = - 1
      n = 1/11

(n - 2)!/(n - 1)! = 1/5
(n - 2)(n - 1)!/(n - 1)! = 1/5
n - 2 = 1/5
5n - 2 = 1
5n = 3
  n = 3/5