Question

Find the sum of the geometric series

Answer 1

i got 4 for an answer but thats not an answer choice

Answer 2

well for an infinite sum the formula is

\[S_{\infty} = \frac{a}{1 - r}\]

the value of a is 3 and r = -1/3

so you are looking at

\[\frac{3}{1 - (\frac{-1}{3})}\]

or

\[S_{\infty} = \frac{3}{\frac{4}{3}}\]

so I don't think the sum will be 4...

Answer 3

i got 9/4?

Answer 4

yep... that makes more sense