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[" 21.If "alpha,beta,gamma" are the root...

[" 21.If "alpha,beta,gamma" are the roots of the equation "],[x^(3)+4x+1=0" ,then the value of "],[(alpha+beta)^(-1)+(beta+gamma)^(-1)+(gamma+alpha)^(-1)" is "],[[" (A) "4," (B) "2],[" (C) "3," (D) "1]]

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