GRE Problem Solving Question 131

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Source: OG2

The operation ⊕ is defined for all integers x and y as x ⊕y = xy - y. If x and y are positive integers, which of the following CANNOT be zero?

  • A x⊕y
  • B y⊕x
  • C (x-1)⊕y
  • D (x+1)⊕y
  • E x⊕(y-1)

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