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[" 155.If "alpha,beta,gamma" are the roo...

[" 155.If "alpha,beta,gamma" are the roots of the equation "x^(3)+4x+1=0" ,"],[" then "(alpha+beta)^(-1)+(beta+gamma)^(-1)+(gamma+alpha)^(-1)" is equal to "],[[" (a) "2," (b) "4," (c) "3," (d) "5]]

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