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[" If "x" ,"y" ,are all different from zero and "],[1+x" ,"1],[[1,1+y,1],[1,1,1+z]|=0" ,then value of "x^(-1)+y^(-1)+z^(-1)" is "],[[" (a) "xyz," (b) "x^(-1)y^(-1)z^(-1)],[" (c) "-x-y-z," (d) "-1]]

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