x is a nonzero number. Is xy < 0?

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by Ian Stewart » Mon Jun 10, 2019 5:47 am

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Each Statement is clearly insufficient alone, since if y is nonzero, we'll get different answers to the question by making x positive or negative.

Using both statements, y must be zero, so xy = 0, and the answer to the question "is xy < 0?" is 'no', so the answer is C.

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