$\mathop {\lim }\limits_{n \to \infty } \left[ {\frac{{\sum_{k=1}^{n} {k^2}}}{{{n^3}}}} \right] = $

  • A
    $ - \frac{1}{6}$
  • B
    $\frac{1}{6}$
  • C
    $\frac{1}{3}$
  • D
    $ - \frac{1}{3}$

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