Question: it like this solution; 3. (9 marks, 3 each) Prove the validity of the following abstract arguments by giving a formal proof using the rules

it like this solution; 3. (9 marks, 3 each) Prove the validity of the following abstract arguments by giving a formal proof using the rules MP, MT, and DN, as needed. a) P Q, Q P b) (P & Q) R, R S, S (P & Q) c) F G, H G, F H

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