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)