\( \lim _{n \rightarrow \infty} \frac{\sum_{r=1}^{n} r^{2}}{n^{3}}= \) (A) \( -\frac{1}{6} \) (B...
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0\( \lim _{n \rightarrow \infty} \frac{\sum_{r=1}^{n} r^{2}}{n^{3}}= \)
(A) \( -\frac{1}{6} \)
(B) \( \frac{1}{6} \)
(C) \( \frac{1}{3} \)
(D) \( -\frac{1}{3} \)
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