$\lim\limits_{n \rightarrow \infty} 6 \tan \left\{\sum\limits_{r=1}^{n} \tan ^{-1}\left(\frac{1}{r^{2}+3 r+3}\right)\right\}$ का मान किसके बराबर है?

  • A
    $1$
  • B
    $2$
  • C
    $3$
  • D
    $6$

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