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 :
Letthen Puttingwe get the desired sum is Alternate Solution Given that the sum of n terms of given series is if n is even. Letbe odd i.e.,. Then, term termYou need to login to perform this action.
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