Math Help - finite geometric series

1. finite geometric series

Find sum of geometric series:

$2 + 2*(0.35) + 2*(0.35)^2 + ... + 2*(0.35)^7$

2. r = 0.35
a = 2
n = 8

S(8) = 2(1-0.35^8)/(1-0.35)
= 3.07623019

Correct?

3. Originally Posted by relyt
r = 0.35
a = 2
n = 8

S(8) = 2(1-0.35^8)/(1-0.35)
= 3.07623019

Correct?
If you have used the correct formula and done the arithmetic correctly then it will be the correct answer.