A) \[\frac{1}{4}\,\,{{n}^{2}}\,{{(n+1)}^{2}}+n\]
B) \[\frac{1}{4}\,\,{{n}^{2}}\,{{(n+1)}^{2}}-n\]
C) \[\frac{1}{4}\,\,n\,\,{{(n+1)}^{2}}-n\]
D) \[\frac{1}{4}\,\,{{n}^{2}}\,{{(n-1)}^{2}}-n\]
E) None of these
Correct Answer: A
Solution :
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