$1 + n(1 - \frac{1}{x}) + \frac{n(n + 1)}{2!}(1 - \frac{1}{x})^2 + \dots \infty$ का योग क्या होगा?

  • A
    $x^n$
  • B
    $x^{-n}$
  • C
    $(1 - \frac{1}{x})^n$
  • D
    इनमें से कोई नहीं

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यदि $|x| > 1$ है,तो $(1 + x)^{-2} = $

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यदि $|x| < 1$ है,तो $1 + n\left( \frac{2x}{1 + x} \right) + \frac{n(n + 1)}{2!}\left( \frac{2x}{1 + x} \right)^2 + \dots \infty$ का मान क्या होगा?

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यदि $(a + bx)^{-2} = \frac{1}{4} - 3x + \dots$ है,तो $(a, b) = $

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