Question: 4. (13 x 4) Use propositional logic to prove that the following arguments are valid: (a) (A -C) A (-CB) A B -A (b)

4. (13 x 4) Use propositional logic to prove that the following

4. (13 x 4) Use propositional logic to prove that the following arguments are valid: (a) (A -C) A (-CB) A B -A (b) (A B) ^ (A(B C)) (A C)

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