श्रेणी का योग ज्ञात कीजिए: $\tan^{-1} \left( \frac{1}{1 + 1 \times 2} \right) + \tan^{-1} \left( \frac{1}{1 + 2 \times 3} \right) + \dots + \tan^{-1} \left( \frac{1}{1 + n(n + 1)} \right) =$

  • A
    $\tan^{-1} \left( \frac{n}{n + 2} \right)$
  • B
    $\tan^{-1} \left( \frac{n + 1}{n} \right)$
  • C
    $\tan^{-1} \left( \frac{n}{n + 1} \right)$
  • D
    $\tan^{-1} \left( \frac{n + 2}{n} \right)$

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