If $n = 1983!$,then the value of the expression $\frac{1}{\log_2 n} + \frac{1}{\log_3 n} + \frac{1}{\log_4 n} + \dots + \frac{1}{\log_{1983} n}$ is:

  • A
    $1$
  • B
    $0$
  • C
    $1983$
  • D
    None of these

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$\tanh^{-1}(\frac{1}{2}) + \operatorname{coth}^{-1}(3) = $

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