$\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 = $

  • A
    $\frac{1}{2} - \log_e \frac{2}{3}$
  • B
    $-\log_e \frac{2}{3}$
  • C
    $\frac{1}{2} + \log_e \left( \frac{2}{3} \right)$
  • D
    આમાંથી કોઈ નહીં

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$1 + \frac{(\log_e n)^2}{2!} + \frac{(\log_e n)^4}{4!} + \dots = $

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?

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