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4. Use truth tables for the following questions. (20pts) (a) Show that (pq)(pr) is equivalent to p(qr) (b) Construct the truth table for this compound

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4. Use truth tables for the following questions. (20pts) (a) Show that (pq)(pr) is equivalent to p(qr) (b) Construct the truth table for this compound proposition: (pq)(pq)

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