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Questions  >>  CBSE XI  >>  Math  >>  Sequences and Series
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Find the sum of $n$ terms of the series $3\times 1^2+5\times 2^2+7\times 3^2+.........$

$\begin{array}{1 1}\large\frac{n(n+1)(3n^2+5n+1)}{3} \\ \large\frac{n(n+1)(3n^2+5n+1)}{6} \\\large\frac{n(n+1)(3n^2+5n-1)}{6} \\ \large\frac{n(n+1)(3n^2+5n-1)}{3} \end{array} $

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