Question

7) Resolva a equação:
a) An,2 = 30
=

Answer 1

Resposta

An,2=30

A=

(n−p)!

n!

=30

A=

(n−2)!

n!

=30

A=

(n−2)!

n(n−1)(n−2)!

=30

n(n−1)=30

n

2

−n−30=0

(n+5)(n−6)=0

n+5=0

n=−5

n−6=0

n=6

S={6}