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