6. Consider the following argument: The chicken is squawking or the egg is hatching. The chicken is squawking. Therefore, the egg is not hatching.

9. Tommy Flanagan was telling you what he ate yesterday afternoon. He tells you, “I had either popcom or raisins. Also, if I had cucumber sandwiches, then I had soda. But I didn't drink soda or tea." Of course you know that Tommy is the world's worst liar, and everything he says is false. What did Tommy eat? Justify your answer by writing all of Tommy's statements using sentence variables (P,Q.R,S,T), taking their negations, and using these to deduce what Tommy actually ate. [8]

Which is the contrapositive of the implication, "If the car has gas, then it will run"? (a) If the car has no gas, then it will not run. (b) If the car will not run, then it has no gas.

Select all the valid argument forms. Opq 9 .. P pV¬q 9 .. P O pv q 9 .. -р