For any numbers $x$ and $y,$ $x@y=xy-x-y.$ If $x@y=1,$ which of the following cannot be the value of $y?$

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by M7MBA » Sat Jun 05, 2021 4:30 am

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For any numbers $x$ and $y,$ $x@y=xy-x-y.$ If $x@y=1,$ which of the following cannot be the value of $y?$

A. -2
B. -1
C. 0
D. 1
E. 2

Answer: D

Source: GMAT Club Tests

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Source: Beat The GMAT — Problem Solving | Sat Jun 05, 2021 4:30 am

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