GMAT Problem Solving
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Source: GWD
Level: 3
The operation ⊙ is defined for all nonzero numbers a and b by a ⊙ b = 
. If x and y are nonzero numbers, which of the following statements must be true?
I.x ⊙ xy = x(1 ⊙ y)
II.x ⊙ y = -(y ⊙ x)
III.
⊙ 
= y ⊙ x
- A I only
- B II only
- C III only
- D I and II
- E II and III