Posted by **sarah** on Thursday, February 21, 2008 at 6:33pm.

Another problem:

determine whether the series is convergent if so find sum

it is the sum from k=1 to infinity of ((-1)^k)/(3^(k+1))

i found this series to be geometric where

a=-1/9 and

r=1/3

my answer was converges to 1/6

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