Source: Official Guide Revised GRE 2nd Ed. Part 9; Section 5; #22

2

The operation is defined for all integers

The operation is defined for all integers x and y as x y = xy – y. If x and y are positive integers, which of the following CANNOT be zero? x y, y x, (x - 1) y, (x + 1) y, x (y - 1)

1 Explanation

2

Gravatar Chris Lele, Magoosh Tutor

Dec 8, 2012 • Comment

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