Question

Dada a P.G 1,-1,1,-1,1,-1... calcule a soma dos 50 primeiros termos

Answer 1

Olá!

a1 = 1
q = -1

Sn = a1 . (q^n - 1) / q - 1
Sn = 1 . ((-1)^50 - 1) / (-1) - 1
Sn = 1 . (1 - 1) / -2
Sn = 1 . 0 / -2
Sn = 0 / -2
Sn = 0