Question: 3. Return to: If both ab and a + b are even, then both a and b are even. 4. Prove: If x and y

3. Return to: If both ab and a + b are even, then
3. Return to: If both ab and a + b are even, then both a and b are even. 4. Prove: If x and y are real numbers such that xy = 0, then x = 0 ory = 0

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