18 (P Q) R (R Q) (P Q) Use conditional proof or indirect proof and the eighteen rules of inference to establish the truth of the following tautologies

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18   (P  Q)  R    (R  Q)  (P  Q)  Use conditional proof or indirect proof and the eighteen rules of inference to establish the truth of the following tautologies

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Question: 18. [(P Q) R] [(R Q) (P Q)] Use conditional proof or indirect proof and the eighteen rules of

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