$S = \tan^{-1}\left( \frac{1}{n^2 + n + 1} \right) + \tan^{-1}\left( \frac{1}{n^2 + 3n + 3} \right) + \dots + \tan^{-1}\left( \frac{1}{1 + (n + 19)(n + 20)} \right)$ है,तो $\tan S$ का मान ज्ञात कीजिए।

  • A
    $\frac{20}{n^2 + 20n + 1}$
  • B
    $\frac{n}{n^2 + 20n + 1}$
  • C
    $\frac{20}{401 + 20n}$
  • D
    $\frac{n}{401 + 20n}$

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