Question

calcule a soma dos temos dessa pg ai na foto. (1, 1/4, 1/16 )

Answer 1

pg = (1, 1/4, 1/6)
Sn = a1.(1-q^n)/(1-q)
q = 1/4 / 1
q = 1/4
n = 3
a1 = 1
Sn = 1.(1-(1/4)³) / 1-1/4
Sn = (1-1/64) / 3/4
Sn = (64/64 - 1/64) / 3/4
Sn = (63/64) / 3/4
Sn = 63/64 . 4/3
Sn = 63/3 . 64/4
Sn = 21 . 16
Sn = 336