Find the sum of the geometric series if: n = 8, r = 3, a = 1.

asked Dec 22, 2022 37.6k views

2 votes

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2 votes

Answer:

$\huge\boxed{S_8=3,280}$

Explanation:

The formula:

S_n=(a_1(1-r^n))/(1-r)

Substitute:

$n=8;\ r=3;\ a_1=1\\\\S_8=(1\cdot(1-3^8))/(1-3)=(1-6,561)/(-2)=(6,560)/(2)=3,280$

Broti answered Dec 28, 2022

by Broti

4.2k points

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