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