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Question -

3 × 12 + 5 × 22 +7 × 32 + …



Answer -

Given series is 3 ×12 +5 × 22 + 7 × 32 + …

It’s seen that,

nth term, an = ( 2n +1) n2 = 2n3 + n2

Then, the sum of nterms of the series can be expressed as

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