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

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9   (P  Q)  (P  R)    P  (Q  R)  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: 9. [(P Q) (P R)] [P (Q R)] Use conditional proof or indirect proof and the eighteen rules of

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