GRE Problem Solving Question 574

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Source: Magoosh

For all numbers a and b, the operation is defined by a ⊕ b = . If xy ≠ 0, then which of the following can be equal to zero?

I. x ⊕ y

II. xy ⊕ y

III. x ⊕ (x + y)

  • A II only
  • B I and II only
  • C I and III only
  • D II and III only
  • E All of the above

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