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  3. 6 indicate which of the following claims is true and...

Question: 6 indicate which of the following claims is true and...

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6. Indicate which of the following claims is true and which is false. P, Q and R are metavariables that stand in the place of any sentences of TFL. (1) i. ~ P is unsatisfiable if and only if P is valid ii. If P Q is valid and P unsatisfiable, then Q must be valid iii. If P and Q are both satisfiable, then (P & Q) must be satisfiable. True True True False False False iv. If R is valid, then (P& Q) R must be valid. True False v. Some valid sentences are not satisfiable. True False

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