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# A closed form for the sum is 1 - (a^n+b)/(3^2n+c - 1) where a and b are integers. Find

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A closed form for the sum $$S = \frac {2}{3+1} + \frac {2^2}{3^2+1} + \cdots + \frac {2^{n+1}}{3^{2^n}+1}$$
is  1 - (a^n+b)/(3^2n+c - 1) where a and b are integers. Find a+ b+ c

Feb 14, 2018
edited by waffles  Feb 16, 2018

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what do we find?

Feb 14, 2018
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sorry

Feb 16, 2018