Question

Calcule a soma dos infinitos termos da PG. (7,7/3,7/9,...)

Answer 1

a1 = 7

Razão:
q = a2/a1
q = (7/3)/7
q = 7/(3 . 7)
q = 1/3

Soma dos infinitos termos:
S∞ = a1/(1 - q)
S∞ = 7/(1 - 1/3)
S∞ = 7/(2/3)
S∞ = 7 . 3/2
S∞ = 21/2