$\frac{1}{1 \cdot 3} + \frac{1}{2} \cdot \frac{1}{3 \cdot 5} + \frac{1}{3} \cdot \frac{1}{5 \cdot 7} + \dots \infty = $

  • A
    $2 \log_e 2 - 1$
  • B
    $\log_e 2 - 1$
  • C
    $\log_e 2$
  • D
    આમાંથી કોઈ નહીં

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જો $0 < y < 2^{1/3}$ અને $x(y^3 - 1) = 1$ હોય,તો $\frac{2}{x} + \frac{2}{3x^3} + \frac{2}{5x^5} + \dots$ ની કિંમત શોધો:

જો $0 < x < 1$ અને $y = \frac{1}{2} x^{2} + \frac{2}{3} x^{3} + \frac{3}{4} x^{4} + \dots$ હોય,તો $x = \frac{1}{2}$ આગળ $e^{1+y}$ ની કિંમત શું થાય?

$\frac{1}{1 \cdot 2} - \frac{1}{2 \cdot 3} + \frac{1}{3 \cdot 4} - \frac{1}{4 \cdot 5} + \dots \infty = $

જો $\tanh ^{-1} x = a \log \left(\frac{1+x}{1-x}\right)$,$|x| < 1$ હોય,તો $a$ ની કિંમત શોધો.

$\frac{1}{1 \cdot 3} + \frac{1}{2 \cdot 5} + \frac{1}{3 \cdot 7} + \frac{1}{4 \cdot 9} + \dots$ ની કિંમત શોધો.

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