3 + 3 ^ 2 + 3 ^ 3 +... + 3^n=3/2*(3^n-1) by mathematical induction
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3 + 3 ^ 2 + 3 ^ 3 +... + 3^n=3/2*(3^n-1) by mathematical induction
I wasn't able to parse your question, but the HE.NET team is hard at work making me smarter.