अनंत श्रेणी $\frac{1}{1 \times 2} - \frac{1}{2 \times 3} + \frac{1}{3 \times 4} - \dots \infty$ का योग किसके बराबर है?

  • A
    $2 \log_e 2$
  • B
    $\log_e 2 - 1$
  • C
    $\log_e 2$
  • D
    $\log_e \left( \frac{4}{e} \right)$

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$\log_{10}\left(\frac{n}{n-1}\right)$ के विस्तार में $n^{-r}$ का गुणांक क्या है?

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

$\frac{2}{1} \cdot \frac{1}{3} + \frac{3}{2} \cdot \frac{1}{9} + \frac{4}{3} \cdot \frac{1}{27} + \frac{5}{4} \cdot \frac{1}{81} + \dots \infty = $

श्रेणी $\frac{1}{2 \times 3} + \frac{1}{4 \times 5} + \frac{1}{6 \times 7} + \dots = $ का योग ज्ञात कीजिए।

$\log_e [(1 + x)^{1 + x} (1 - x)^{1 - x}] = $

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