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

  • A
    ${\log _e} \frac{4}{5}$
  • B
    ${\log _e} \frac{\sqrt{5}}{2}$
  • C
    $2{\log _e} \frac{\sqrt{5}}{2}$
  • D
    इनमें से कोई नहीं

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यदि $\log (1 - x + {x^2}) = {a_1}x + {a_2}{x^2} + {a_3}{x^3} + \dots$ है,तो ${a_3} + {a_6} + {a_9} + \dots$ का मान ज्ञात कीजिए।

यदि $x, y, z$ तीन क्रमागत धनात्मक पूर्णांक हैं,तो $\frac{1}{2}\log_e x + \frac{1}{2}\log_e z + \frac{1}{2xz + 1} + \frac{1}{3}\left( \frac{1}{2xz + 1} \right)^3 + \dots = $

यदि $y = 2x^2 - 1$ है,तो $\left[ \frac{1}{y} + \frac{1}{3y^3} + \frac{1}{5y^5} + \dots \right]$ का मान क्या होगा?

यदि $|x| < 1$ और $y = x - \frac{x^2}{2} + \frac{x^3}{3} - \frac{x^4}{4} + \ldots$ है,तो $x$ का मान क्या होगा?

$\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 = $

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