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Questions  >>  CBSE XI  >>  Math  >>  Sequences and Series
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Find the sum of $n$ terms of the series $3+7+13+21+31+.............$

$\begin{array}{1 1} \large\frac{n}{3}\big[n^2+3n+5\big] \\ \large\frac{n}{3}\big[n^2-3n+5\big] \\ \large\frac{n}{3}\big[n^2+3n-5\big] \\ \large\frac{n}{3}\big[n^2+4n+5\big]\end{array} $

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