Let S_n = Σ_(k=1) ^(4n) (−1)^((k(k+1))/2) k^2 . Then S_n can take the value(s) 1) 1056 2) 1088 3) 1120 4) 1332.


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Question Number 31864 by rahul 19 last updated on 16/Mar/18

$L e t S_{n} = \underset{k = 1}{\sum^{4 n}} {(- 1)}^{\frac{k (k + 1)}{2}} k^{2} .$ $T h e n S_{n} c a n t a k e t h e v a l u e (s)$ $1) 1056$ $2) 1088$ $3) 1120$ $4) 1332 .$
	Answered by Tinkutara last updated on 16/Mar/18

	Commented by Tinkutara last updated on 16/Mar/18

	Commented by rahul 19 last updated on 16/Mar/18

	$t h a n k u!$
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