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Question: discrete mathprove and disprove...

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Discrete math:prove and disprove

3. Prove for disprove each of the following statements. (a) For all integers z, a + a is even. (b) For all integers y, there is an integer x so that x3+x y. (c) For all integers x and y, ifr3 +x уз + y then x y.
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