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Predicate Logic 3. (There are two possibilities here – see if you can find them both!) Prove that any in nite set A contains a countably in nite subset. WUCT121 Logic Tutorial Exercises Solutions 1 WUCT121 Discrete Mathematics Logic Tutorial Exercises Solutions 1. (b) Again using one of your answers to question 5, write a definition of A Δ B using only symbols from the list ∩, ∪ and ′. 6 (a) One of the shaded regions in question 5 represents the set A – B.Identify which one it is, and hence write a definition of A – B using only symbols from the list ∩, ∪ and ′. • SOLUTIONS TO ODD-NUMBERED EXERCISES The bulk of this work consists of solutions to all the odd-numbered exercises in the text. 1 Exercise Set 7.4, p. 440: Cardinality and Computability Exercise 26. This may involve studying with other students and/or looking at other books and videos that cover the same material. Set Theory 5. 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