Question

resolva essa equaçao: (n-1)!÷(n-3)=12

Answer 1

Oi Lays

(n - 1)!/(n - 3)! =12

(n - 1)*(n - 2)*(n - 3)!/(n - 3)! = 12

n² - 3n + 2 = 12

n² - 3n - 10 = 0

delta
d² = 9 + 40 = 49
d = 7

n = (3 + 7)/2 = 10/2 = 5