GMAT Problem Solving
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Source: GWD
Level: 0
The operation Θ is defined by for all nonzero numbers x and y. If z is a number greater than 1, which of the following must be true?
I. zΘ(-z) = 0
II.
III.
- A I only
- B I and II only
- C I and III only
- D II and III only
- E I, II, and III