Question 1 [3 points + 3 points] Determine whether the following argument forms are valid by using a truth table. 1. if P then Q . . if Q then P 2. not (P and Q) . (not P) or (not O) Question 2 [5 points] Use a truth table to determine whether or not the following set of sentences is consistent. Start by writing down, for each sentence, the propositional formula that it is an instance of. |Hint: you will need three proposition letters.] If hamburgers are not delicious then hamburgers are both not healthy and not popular. Hamburgers are healthy. Hamburgers are not delicious. Question 3 [3 points] Give a counterexample to show the following form is invalid. Por Q .. P and