$\log_e x - \log_e (x - 1) = $

  • A
    $\frac{1}{x} - \frac{1}{2x^2} + \frac{1}{3x^3} - \dots \infty $
  • B
    $\frac{1}{x} + \frac{1}{2x^2} + \frac{1}{3x^3} + \dots \infty $
  • C
    $2 \left( \frac{1}{x} + \frac{1}{3x^3} + \frac{1}{5x^5} + \dots \infty \right)$
  • D
    $2 \left( \frac{1}{x} - \frac{1}{3x^3} + \frac{1}{5x^5} - \dots \infty \right)$

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ધારો કે $S_{k}$ એ અનંત $GP$ શ્રેણીનો સરવાળો છે જેનું પ્રથમ પદ $k$ છે અને સામાન્ય ગુણોત્તર $\frac{k}{k+1}$ $(k>0)$ છે. તો, $\sum_{k=1}^{\infty} \frac{(-1)^{k}}{S_{k}}$ નું મૂલ્ય કેટલું થાય?

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

$(0.5) - \frac{(0.5)^2}{2} + \frac{(0.5)^3}{3} - \frac{(0.5)^4}{4} + \dots$

$\frac{1}{n^2} + \frac{1}{2n^4} + \frac{1}{3n^6} + \dots \infty = $

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

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