Question

5. Calcule a soma dos oitos primeiros termos da P.G (320,160,80,...)

quero o calculo galera pf

Answer 1

A formula é $Sn= \frac{a1(q^n-1)}{q-1}$

$Sn= \frac{320(2^8-1)}{2-1}$

$Sn= \frac{320(256-1)}{1}$

$Sn= \frac{320.(255)}{1}$

$Sn=81600/1$

Sn=81600