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Test: GRE Math
The operation ¤ is defined for all integers x and y as: x ¤ y = 4x-y2.
1. | If x and y are positive integers, which of the following cannot produce an odd value? |
x ¤ 2y
x ¤ (y+1)
x ¤ y
y ¤ x
x ¤ y2
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