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An ordered pair (alpha, beta) for which ...

An ordered pair `(alpha, beta)` for which the system of linear equations `(1+alpha)x+betay+z=2`, `alphax+(1+beta)y+z=3` and `alphax+betay+2z=2` has unique solution is:
(a) (2,4)
(b) (-3,1)
(c) (-4,2)
(d) (1,-3)

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