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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Similar Questions

$|x| < 1$ માટે,$x$ ની ચડતી ઘાતમાં $\log(1+x+x^2)$ ના વિસ્તરણમાં $x^3$ નો સહગુણક શું છે ($/3$ માં)?

$\frac{1}{2}x^2 + \frac{2}{3}x^3 + \frac{3}{4}x^4 + \dots \infty = $

$\frac{1}{2} - \frac{1}{2 \cdot 2^2} + \frac{1}{3 \cdot 2^3} - \frac{1}{4 \cdot 2^4} + \ldots$ ની કિંમત શોધો.

જો $4\left[ {{x^2} + \frac{{{x^6}}}{3} + \frac{{{x^{10}}}}{5} + \dots} \right] = {y^2} + \frac{{{y^4}}}{2} + \frac{{{y^6}}}{3} + \dots$ હોય,તો

$\frac{1}{2} + \frac{1}{3} \cdot \frac{1}{2^3} + \frac{1}{5} \cdot \frac{1}{2^5} + \dots \infty$ નો સરવાળો કેટલો થાય?

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