Răspuns:
(216!) / (214!) = 215*216 = 46.440
(n+1)! / (n-1)! = n(n+1)
Explicație pas cu pas:
[tex]\frac{216!}{214!} = \frac{214! * 215*216}{214!} = 215*216 = 46.440[/tex]
[tex]\frac{(n+1)!}{(n-1)!} = \frac{(n-1)!*n*(n+1)}{(n-1)!} = n(n+1)[/tex]
