Posted by **Paul** on Wednesday, September 19, 2012 at 11:32pm.

Find the sum of each of the convergent series:

b) 5 - 1/3 + 20/9 - 40/27 + 80/81 .....

so first we need to find the general term, and I'm not sure of my answer, but I got:

((-1)^2 * 2!)/3^n and a0 = 5

From here on I'm lost.

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