Question

Simplifique as expressões abaixo:
(n-4)! (n-3)!
(2n)! (2n-2)!

Answer 1

Boa noite Lanamara

(n - 4)!/(n - 3)! = (n - 4)!/(n - 4)*(n - 3) = 1/(n - 3) 

(2n)!/(2n - 2)! 

m = 2n

m!/(m - 2)! = m*(m - 1)*(m - 2)!/(m - 2)! = m*(m - 1)

= 2n*(2n - 1) = 4n² - 2n