3. Which of the following has no solution? x-y+3z=0 3x-y+4z=2 2x+5y+z=7 a. b. 3x-y=0 x+y+z=0 2x-3z=0 c. x+3y-4z-w=3 2x+3y-3z-w=1 3x+6y-7z-2w=0

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