Posted by **kelly** on Tuesday, April 17, 2007 at 11:19pm.

find the sum of the series of (-2)^n/3^n+1.

This is an alternating series...

what if we rewrite it as

an= (1/3)* (-2/3)^(n)

Divide any nth term by the n-1 term and see if you get a ratio term r. This might be a geometric series.

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