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Consider the system of equations x+a y=0...

Consider the system of equations `x+a y=0,\ y+a z=0.\ ` Then the set of all real values of `' a '` for which the system has a unique solution is: `{1,\ -1}` b. `\ R-{-1}` c.`\ {1,\ 0,\ -1}` d. `R-{1}`

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