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Let E denote the set of even integers, i.e. E = {r Z (3yZ) (r = 2y)}. Let O'= {Z (3yZ) (= = 2y

Let E denote the set of even integers, i.e. E = {r Z (3yZ) (r = 2y)}. Let O'= {Z (3yZ) (= = 2y + 1)}. Prove, using the proof by contradiction, that O'CZ-E.

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