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SECTION 4.2 Direct Proof and Counterexample II: Rational ...
are even. 2. The sum and difference of any two odd integers are even. 3. The product of any two odd integers is odd. 4. The product of any even integer and any odd integer is even. 5. The sum of any odd integer and any even integer is odd. 6. The difference of any odd integer minus any even integer is odd. 7.
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