$\lim _{n \rightarrow \infty} \frac{\left(1^2-1\right)(n-1)+\left(2^2-2\right)(n-2)+\ldots +\left((n-1)^2-(n-1)\right) \cdot 1}{\left(1^3+2^3+\ldots +n^3\right)-\left(1^2+2^2+\ldots +n^2\right)}$ का मान है:

  • A
    $\frac{2}{3}$
  • B
    $\frac{1}{3}$
  • C
    $\frac{3}{4}$
  • D
    $\frac{1}{2}$

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