$\mathop {\lim }\limits_{n \to \infty } \frac{1}{n}\sum\limits_{r = 1}^{2n} {\frac{r}{{\sqrt {{n^2} + {r^2}} }}} $ का मान ज्ञात कीजिए।

  • A
    $1 + \sqrt{5}$
  • B
    $-1 + \sqrt{5}$
  • C
    $-1 + \sqrt{2}$
  • D
    $1 + \sqrt{2}$

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निम्नलिखित निश्चित समाकल का योगफल की सीमा के रूप में मान ज्ञात कीजिए:
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