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Algebra Level pending

k = 1 4 n ( 1 ) k ( k + 1 ) / 2 k 2 \large \sum_{k=1}^{4n} (-1)^{k (k+1)/2} \cdot k^2

Which of the following values can the above expression take. 1 ) 264 1) 264 2 ) 272 2) 272 3 ) 280 3) 280 4 ) 333 4) 333

*Details and Assumptions:- * More than one options may be correct ! Give your answer as the sum of the possible values from the given options. Give answer as 50 if you think none of the options is correct.


The answer is 272.

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