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



  • A I only
  • B I and II only
  • C I and III only
  • D II and III only
  • E I, II, and III

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