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## Homework Statement

The sum of ((n+1)*3^n)/(2^2n)

## Homework Equations

absolute value of r must be less than 1 for the series to be convergent.

## The Attempt at a Solution

i tried multiplying it out and splitting it up like:

3^n*n/(2^(2n))+3^n/(2^(2n))

but then i am stuck when I try to pull the nth power out...help?