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Question: 7 true false for all sets a b we have...

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7. True False: For all sets A, B, we have AnBCAUB. 8. True False: In a direct proof of HC it is OK to use -C as a step. 9. True False: cat Ct is true for the relation C(x, y): the word z uses letter y. 10. True False: The relation on the set of all people S(z,y): and y are the same age is transitive. 11. True False: The smallest counterexample to the proposition For every positive integer n, the umbe 1 is a prime 12. True False: The relation G(r, y) z has met y is an equivalence relation on the set of all people.

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