જો $S_n = \frac{n(n + 1)(n + 2)}{6}$ હોય,તો $\sum_{n = 1}^\infty \frac{1}{t_n} = $

  • A
    $1$
  • B
    $6$
  • C
    $2$
  • D
    $\frac{1}{6}$

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