Question: 6. (8 marks) For each argument below, if it is valid then give a proof using the rules of inference; if it is invalid then

6. (8 marks) For each argument below, if it is valid

6. (8 marks) For each argument below, if it is valid then give a proof using the rules of inference; if it is invalid then give a truth assignment under which the premises evaluate to true while the conclusion is false. (a) pVq ~ r-it (b) ~p

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