A) \[\frac{{{n}^{3}}\,{{(n+1)}^{3}}+(n+3)}{6}\]
B) \[\frac{n\,(n+1)\,\,(3{{n}^{2}}+7n+2)}{12}\]
C) \[\frac{n\,(n+1)}{6}\,\,[n\,(n+1)+(2n+1)]\]
D) \[\frac{n\,(n+1)}{18}\,\,[6n\,(n+1)+2\,(2n+1)]\]
E) None of these
Correct Answer: B
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