Let \( S_{n}=\sum_{k=1}^{4 n}(-1)^{\frac{k(k+1)}{2}} k^{2} \). Then \( S_{n} \) can take value(s...
Let \( S_{n}=\sum_{k=1}^{4 n}(-1)^{\frac{k(k+1)}{2}} k^{2} \). Then \( S_{n} \) can take value(s)
(1) 1056
(2) 1088
(3) 1120
(4) 1332
(JEE Advanced 2013)
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