$\mathop {\lim }\limits_{n \to \infty } \left[ {\frac{1}{n} + \frac{1}{{\sqrt {{n^2} + n} }} + \frac{1}{{\sqrt {{n^2} + 2n} }} + \dots + \frac{1}{{\sqrt {{n^2} + (n - 1)n} }}} \right]$ का मान ज्ञात कीजिए।

  • A
    $2 + 2\sqrt{2}$
  • B
    $2\sqrt{2} - 2$
  • C
    $2\sqrt{2}$
  • D
    $2$

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