Question

poderiam me ajudar? ​

Answer 1

Resposta:

Explicação passo a passo:

1)a)5!*4!                        b)10!/3!7!

5*4*3*2*1*4*3*2*1          10*9*8*7/3*2*1*7    ⇒  cancela o 7

120*24                            720/6=120

2880

c)7!/4!+3!=7*6*5*4*3*2*1/4*3*2*1+3*2*1=5040/24+6=5040/30=168

2)a)(n+2)!/(n+3)!=(n+2)!/(n+3)(n+2)=1/n+3

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

c)(n+3)!/(n+2)!=(n+3)(n+2)/(n+2)=n+3