Question

BRAINLIEST Question

Find the sum of the series up to n terms whose Tn is
(2n + 1)2^n.
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Answer 1

Hey bro

Given Tn so find a1

Then by formula Sn=n/2 * (A1+An)

So i got the sum as (8n^3 + 17n^2 + 2n)/2

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