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Find the sum of the first ‘n’ terms of the series, 3 + 7 + 13 + 21 + 31 +…………

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Find the sum of the first ‘n’ terms of the series, 3 + 7 + 13 + 21 + 31 +…………
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Let Tn= nth term of the series and Sn = Sum of first ‘n’

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