$\frac{1}{5} + \frac{1}{2} \cdot \frac{1}{5^2} + \frac{1}{3} \cdot \frac{1}{5^3} + \dots \infty = $

  • A
    ${\log _e} \frac{4}{5}$
  • B
    ${\log _e} \frac{\sqrt{5}}{2}$
  • C
    $2{\log _e} \frac{\sqrt{5}}{2}$
  • D
    इनमें से कोई नहीं

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यदि $4\left[ {{x^2} + \frac{{{x^6}}}{3} + \frac{{{x^{10}}}}{5} + \dots} \right] = {y^2} + \frac{{{y^4}}}{2} + \frac{{{y^6}}}{3} + \dots$ है,तो

विस्तार $\log_e(1 + x) = \sum\limits_{i = 1}^\infty \left[ \frac{(-1)^{i + 1}x^i}{i} \right]$ किसके लिए परिभाषित है:

$\frac{1}{1 \cdot 3} + \frac{1}{2 \cdot 5} + \frac{1}{3 \cdot 7} + \frac{1}{4 \cdot 9} + \dots$ का मान ज्ञात कीजिए।

यदि $S = \sum\limits_{n = 0}^\infty \frac{(\log x)^{2n}}{(2n)!}$ है,तो $S$ =

$\frac{1}{2 \cdot 3} + \frac{1}{4 \cdot 5} + \frac{1}{6 \cdot 7} + \frac{1}{8 \cdot 9} + \dots$ का मान ज्ञात कीजिए।

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