Question

Fatorialll alguém de bom coração me ajuda????

Answer 1

(n+1)! (n-1)!

------------ = ---------

3!.(n-1)! (n-2)!

(n+1).n.(n-1)! (n-1).(n-2)!

---------------------- = --------------------

6.(n-1)! (n-2)!

(n+1).n

------------ = (n-1)

6

n²+n = 6n-6

n² -5n +6 = 0

(n-2) . (n-3) =0

n'=2 n"=3 <=======®