What is the coefficient of y3x8 in (x+y)−5 is equal to____________, where |yx|<1

(x+y)−5=x−5(1+yx)−5=x−5{1+5(yx)+5.62!(yx)2+5.6.73!(yx)3+.......}

What is the coefficient of y3x8 in (x+y)−5 is equal to____________, where |yx|<1

(x+y)−5=x−5(1+yx)−5=x−5{1+5(yx)+5.62!(yx)2+5.6.73!(yx)3+.......}

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What is the coefficient of $\frac{y^{3}}{x^{8}}$ in ${(x + y)}^{- 5}$ is equal to____________, where $| \frac{y}{x} | < 1$

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${(x + y)}^{- 5} = x^{- 5} {(1 + \frac{y}{x})}^{- 5} = x^{- 5} {1 + 5 (\frac{y}{x}) + \frac{5.6}{2!} {(\frac{y}{x})}^{2} + \frac{5.6.7}{3!} {(\frac{y}{x})}^{3} + .......}$

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What is the coefficient of y3x8 in (x+y)−5 is equal to____________, where |yx|<1

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What is the coefficient of $\frac{y^{3}}{x^{8}}$ in ${(x + y)}^{- 5}$ is equal to____________, where $| \frac{y}{x} | < 1$