A) \[-{{\left[ \frac{n\,\,(n+1)}{2} \right]}^{2}}\]
B) \[{{\left[ \frac{n\,\,(n+1)}{2} \right]}^{2}}\]
C) \[\frac{n\,\,(n+1)}{2}\]
D) \[{{\left[ \frac{n\,\,(n+1)\,\,(2n+1)}{6} \right]}^{2}}\]
E) None of these
Correct Answer: A
Solution :
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