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Question 1
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Let $x,y,z$ be distinct integers. $x$ and $y$ are odd positive integers and $z$ is an even positive integer. Which of the following cannot be true?
A.
$(x-z)^2$ is even
B.
$(x-z)y^2$ is odd
C.
$(x-zy)$ is odd
D.
$(x-y)^2z$ is even
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