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[" If the system of equations "2x+3y-z=0,x+ky-2z=0" and "2x-y+z=0" has a non-trivial solution "],[(x,y,z)" then "(x)/(y)+(y)/(2)+(z)/(x)+k" is equal to "],[[" (A) "3/4," (B) "-4," (C) "1/2," (D) "-1/4]]

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