Let S be the series S= n=0 E to infinity of (t/(1+t))^n where t is not = to 0.?

mumei_kumori

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Let S be the series S= n=0 E to infinity of (t/(1+t))^n where t is not = to 0.

A.) find the value to which S converges when t=1. (I got 2 for this?)
B.) determine the values of t for which S converges. justify answer.
C.) Find all values of t that make the sum of series S > 10.

just want to make sure that part A is correct, but I need help on b and c..
 
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