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number 18 In Exercises 1324, use propositional logic to prove that the argument is valid. Section 1.2 Propositional Logic 18. [A ( BC)]^(AV D') AB(

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In Exercises 1324, use propositional logic to prove that the argument is valid. Section 1.2 Propositional Logic 18. [A ( BC)]^(AV D') AB( DC ) 19. (A' B') ABA (A C) C 20.( AB) A[B ( CD)] A[A ( BC)] ( AD) 21. [A ( B C )] [B (A C)] 22. (A AB) (A B')' 23. (A C)^( CB') ABA' 24. (A (BVC)] AC' ( A B ) llanin ta nrove the validity of the arguments in Exercises 25-33. These will b

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