यदि $|x| < 1$ है,तो $(1 + x + x^2 + ....)^2$ के विस्तार में $x^n$ का गुणांक क्या होगा?

  • A
    $1$
  • B
    $n$
  • C
    $n + 1$
  • D
    इनमें से कोई नहीं

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$\frac{1}{4}-\frac{5}{4 \cdot 8}+\frac{5 \cdot 9}{4 \cdot 8 \cdot 12}-\ldots=$

$1 + \frac{1}{4} + \frac{1 \times 3}{4 \times 8} + \frac{1 \times 3 \times 5}{4 \times 8 \times 12} + \dots = $

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यदि $x = \frac{1}{5} + \frac{1 \times 3}{5 \times 10} + \frac{1 \times 3 \times 5}{5 \times 10 \times 15} + \ldots$ है,तो $3x^2 + 6x =$

$0 < x < 1$ के लिए,$\left(1+\frac{1}{x}\right)^{\frac{1}{2}}$ का विस्तार क्या है?

$1 - \frac{3}{16} + \frac{1 \cdot 4}{1 \cdot 2} \left(\frac{3}{16}\right)^2 - \frac{1 \cdot 4 \cdot 7}{1 \cdot 2 \cdot 3} \left(\frac{3}{16}\right)^3 + \ldots$

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