Question: What is wrong with this proof? Proposition: Suppose XEZ. If X is odd, then 3x + 6 is odd. Proof: Suppose X is not odd.

What is wrong with this proof? Proposition: Suppose XEZ. If X is odd, then 3x + 6 is odd. Proof: Suppose X is not odd. Then x = 2n is odd. Proof: Suppose X is not odd. Then x = 2n for some Z . Then 3x + 6 = 3 (2n) + 6 = 2 (3n+3) is not odd

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