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Questions  >>  CBSE XI  >>  Math  >>  Sequences and Series
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Find the sum of $n$ terms of the series $(3\times 8)+(6\times 11)+(9\times 14).............$

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

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