सूत्र $(a + b)^m = a^m + ma^{m-1}b + \frac{m(m - 1)}{1 \cdot 2}a^{m - 2}b^2 + \dots$ कब मान्य है?

  • A
    $b < a$
  • B
    $a < b$
  • C
    $|a| < |b|$
  • D
    $|b| < |a|$

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यदि $(a+bx)^{-3} = \frac{1}{27} + \frac{1}{3}x + \dots$ है,तो क्रमित युग्म $(a, b)$ का मान ज्ञात कीजिए।

$1+\frac{1}{4}+\frac{1 \cdot 3}{4 \cdot 8}+\frac{1 \cdot 3 \cdot 5}{4 \cdot 8 \cdot 12}+\ldots$ का मान ज्ञात कीजिए।

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

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$1+\frac{4}{15}+\frac{4 \times 10}{15 \times 30}+\frac{4 \times 10 \times 16}{15 \times 30 \times 45}+\ldots \quad \infty=$

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