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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