Section 3. Each problem is worth 5 points. Truth table. Determine whether or not the following logical form is valid by using the truth table method. You must set your truth table up like I did in the...

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Section 3. Each problem is worth 5 points. Truth table. Determine whether or not the following logical form is valid by using the truth table method. You must set your truth table up like I did in the video lectures and you must show your work. 20. 1) (P v Q)  (P & Q) 2) (P  Q) & (Q  P) 21. 1) ~(P & R)  (~P v Q) 2) ~(P  Q) 3) P & R Section 4. Each proof is worth 5 points. Prove that the following sequents are valid using natural deduction. You must do your proofs like they were done in the video lectures. 22. (–P --> –R) & (–Q --> –R) ⊢ (–P v –Q) --> –R) 23. –(P & –Q) ⊢ P --> Q Final Exam Assignment