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Question: 6 let z be a real mumber prove that if...

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(6) Let z be a real mumber. Prove that if 2 and (a+1)9 are both rational numbers, then a is a rational number.
(3) Let A, B, C be sets. Decide whether each of the following statements are true or false. If true, give a proof; if false, give a counterexample. (a) AU(Bnc)-(AUB)nC (b) AnBC A\B. HOMEWORK 2 (c) A\(B\C)드 (A \ B) UC (d) (A\ B)U(Anc) C (A\B)\C
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