Question

matemática

conteúdo: fatorial​

Answer 1

10!/8! = 10.9.8!/8! = 10.9 = 90

8/5!.3! = 8.7.6.5!/5!.6 = 8.7= 56

(n+1)!/n! = (n+1).n!/n! = n+1

n!/(n+1)! = n!/(n+1).n! = 1/n+1