योगफल $\sum\limits_{n = 1}^\infty {{\cot }^{ - 1}} \left( {\frac{{2\left( {\sum\limits_{k = 1}^n k } \right) - 1}}{3}} \right)$ का मान ज्ञात कीजिए।

  • A
    $\frac{3\pi}{4} + \cot^{-1} 2$
  • B
    $\frac{\pi}{2} + \cot^{-1} 3$
  • C
    $\pi$
  • D
    $\frac{\pi}{2} + \tan^{-1} 2$

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