3. Let a, b R. Prove that if a is rational, and ab is irrational, then...
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3. Let a, b R. Prove that if a is rational, and ab is irrational, then b is irrational. 4. Let a, b = Z. Prove that if 4|(a + b), then a and b are not both odd. 3. Let a, b R. Prove that if a is rational, and ab is irrational, then b is irrational. 4. Let a, b = Z. Prove that if 4|(a + b), then a and b are not both odd.
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