સરવાળો શોધો: $\sum\limits_{k = 1}^n \frac{1}{\log_{2^k}(a)}$

  • A
    $\frac{n(n + 1)}{2} \log_a 2$
  • B
    $\frac{n(n + 1)}{2} \log_2 a$
  • C
    $\frac{(n + 1)^2 n^2}{4} \log_2 a$
  • D
    આમાંથી કોઈ નહીં

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