Question: 1. Proof using a proof by exhaustion. For every integer n such that 0 s n 3. 2. Direct proof: (a) If x is a

1. Proof using a proof by exhaustion. For every integer n such that 0 s n 3. 2. Direct proof: (a) If x is a real number and x o. (b) The product of two rational numbers is rational 3. Prove the following statement using proof by contrapositive. Given that x and y are real numbers, if x+y>20, then x>10 or y>10

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