7) (20 marks) Use the rules of inference and the laws of propositional logic to prove...

 

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7) (20 marks) Use the rules of inference and the laws of propositional logic to prove that the following arguments are valid. (a) 3x (P(x) Q(x)) 3x Q(x) 3x P(x) (b) Vx (P(x) A Q(x)) VxQ(x) A VxP(x) 7) (20 marks) Use the rules of inference and the laws of propositional logic to prove that the following arguments are valid. (a) 3x (P(x) Q(x)) 3x Q(x) 3x P(x) (b) Vx (P(x) A Q(x)) VxQ(x) A VxP(x)

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a 3 px 0x It means there exist x Px is truevalid I mens these exist A means And such that And the... View the full answer