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For what ordered pair (alpha, beta) the ...

For what ordered pair `(alpha, beta)` the system of equations `(1+alpha)x+betay+z=0, alphax+(1+beta)y+z=0` `ax+betay+2z=0` has unique solution (A) `(-3,1)` (B) `(2,4)` (C) `(-4,2)` (D) `(1,-3)`

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