Question: 3. Use proof by contradiction or contrapositive proof, as appropriate, for each of the following. (a) Prove that if n' is divisible by 6, then

3. Use proof by contradiction or contrapositive proof, as appropriate, for each of the following. (a) Prove that if n' is divisible by 6, then n is divisible by 6. Assume domain of n is positive integers. (b) Let the domain of a and y be positive real numbers. Suppose z is rational and y is irrational. Prove that x/y is irrational

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