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3. Prove the following Proposition. Proposition: If a, b E R and a + b > 100 then a > 50 or b > 50.

3. Prove the following Proposition. Proposition: If a, b E R and a + b > 100 then a > 50 or b > 50. 4. Prove the following Proposition. Proposition: Let n E Z, n is even if and only if n2 is even

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