A) $ \frac{n(4n^{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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Answer:
Solution:
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