કિંમત શોધો: $\log _e(x + 1) - \log _e(x - 1) = $

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

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$1 + \frac{2}{1 \times 2 \times 3} + \frac{2}{3 \times 4 \times 5} + \frac{2}{5 \times 6 \times 7} + \dots$ નો સરવાળો કેટલો થાય?

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અનંત શ્રેણી $\frac{1}{1 \times 2} - \frac{1}{2 \times 3} + \frac{1}{3 \times 4} - \dots \infty$ નો સરવાળો કેટલો થાય?

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

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