$1 + \frac{a - b}{a} + \frac{1}{2!} \left( \frac{a - b}{a} \right)^2 + \frac{1}{3!} \left( \frac{a - b}{a} \right)^3 + \dots \infty = $

  • A
    $e^{b - a}$
  • B
    $e^a$
  • C
    $\frac{e}{e^{b/a}}$
  • D
    $\frac{e}{e^{a/b}}$

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$\sum_{k=1}^{\infty} \frac{1}{k !} \left(\sum_{n=1}^k 2^{n-1}\right)$ का मान ज्ञात कीजिए।

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$(2+3x)e^{-x}$ के विस्तार में $x^{10}$ का गुणांक क्या है?

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श्रेणी $1 + \frac{x^2}{2!} + \frac{x^4}{4!} + \dots$ का अनंत तक योग क्या है?

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