Find the sum of $n$ terms of the series $(3\times 8)+(6\times 11)+(9\times 14).............$

Question

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