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( 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