A) \[\frac{n\,(n+1)}{2}\]
B) \[\frac{n\,(n+1)\,\,(2n+1)}{12}\]
C) \[\frac{1}{n\,(n+1)}\]
D) \[\frac{n\,(n+1)}{4}\]
E) None of these
Correct Answer: D
Solution :
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