What is the sum of an infinite geometric series if the first term is 156 and the common ratio is 2⁄3? A. 260 B. 468 C. 234 D. 208

S = a0 / (1 - r)

S is the sum

a0 is the first term

r is the ration

The sum is 2, and the first term is 0.5, so plug in what you know and see what you come up with:

2 = 0.5 / (1 - r)

That's an equation you can solve:

2 (1 - r) = 0.5

1 - r = 0.5 / 2 = 0.25

0.75 - r = 0

0.75 = r

Ratio is 0.75.