यदि $\frac{1}{x(x + 1)(x + 2)...(x + n)} = \frac{A_0}{x} + \frac{A_1}{x + 1} + \frac{A_2}{x + 2} + .... + \frac{A_n}{x + n}$ है,तो $A_r = $

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

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यदि $\frac{2 x^2+5 x+6}{(x+2)^3}=\frac{a}{x+2}+\frac{b}{(x+2)^2}+\frac{c}{(x+2)^3}$ है,तो $a \cdot b+b \cdot c+c \cdot a=$

$\frac{x^2 + 13x + 15}{(2x + 3)(x + 3)^2} = $

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यदि $\frac{3 x^4-2 x^2+1}{(x-2)^4}=A+\frac{B}{x-2}+\frac{C}{(x-2)^2}+\frac{D}{(x-2)^3}+\frac{E}{(x-2)^4}$ है, तो $2 A+3 B-C-D+E=$

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