ધારો કે $S_n = \sum_{k=1}^n \frac{n}{n^2+kn+k^2}$ અને $T_n = \sum_{k=0}^{n-1} \frac{n}{n^2+kn+k^2}$ જ્યાં $n=1, 2, 3, \ldots$ છે. તો,

  • A
    $S_n < \frac{\pi}{3\sqrt{3}}$
  • B
    $S_n > \frac{\pi}{3\sqrt{3}}$
  • C
    $T_n < \frac{\pi}{3\sqrt{3}}$
  • D
    $T_n > \frac{\pi}{3\sqrt{3}}$

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