A) \[\frac{n(4{{n}^{2}}+6n)-1}{3}\]
B) \[\frac{n(n+1)(n+2)}{2}\]
C) \[\frac{(2n+1)(n+1)}{2}\]
D) \[\frac{{{n}^{2}}+1}{4}\]
Correct Answer: A
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