જો $|a| < 1$ અને $b = \sum_{k=1}^{\infty} \frac{a^k}{k}$ હોય,તો $a$ ની કિંમત શું થાય?

  • A
    $\sum_{k=1}^{\infty} \frac{(-1)^k b^k}{k}$
  • B
    $\sum_{k=1}^{\infty} \frac{(-1)^{k-1} b^k}{k!}$
  • C
    $\sum_{k=1}^{\infty} \frac{(-1)^k b^k}{(k-1)!}$
  • D
    $\sum_{k=1}^{\infty} \frac{(-1)^{k-1} b^k}{(k+1)!}$

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$\frac{1}{2 \cdot 3} + \frac{1}{4 \cdot 5} + \frac{1}{6 \cdot 7} + \frac{1}{8 \cdot 9} + \dots$ ની કિંમત શોધો.

$\frac{1}{x + 1} + \frac{1}{2(x + 1)^2} + \frac{1}{3(x + 1)^3} + \dots \infty = $

$\frac{1}{1 \cdot 3} + \frac{1}{2 \cdot 5} + \frac{1}{3 \cdot 7} + \frac{1}{4 \cdot 9} + \dots$ ની કિંમત શોધો.

$1 + \frac{(\log_e n)^2}{2!} + \frac{(\log_e n)^4}{4!} + \dots = $

$\log _4 2 - \log _8 2 + \log _{16} 2 - \ldots$ ની કિંમત શોધો.

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