The value of \( \lim _{n \rightarrow \infty} \frac{1-n^{2}}{\sum_{r=1}^{n} r} \) will be (a) -2 ...

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The value of \( \lim _{n \rightarrow \infty} \frac{1-n^{2}}{\sum_{r=1}^{n} r} \) will be
(a) -2
(b) -1
(c) 2
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