Question: Prove that each argument is valid by replacing each proposition with a variable to obtain the form of the argument. Then use the rules of

 Prove that each argument is valid by replacing each proposition with

Prove that each argument is valid by replacing each proposition with a variable to obtain the form of the argument. Then use the rules of inference to prove that the form is valid (a) If I drive on the freeway, I will see the fire. I will drive on the freeway or take surface streets (or both) I am not going to take surface streets. I will see the fire (b) If it was not foggy or it didn't rain (or both), then the race was held and there was a trophy ceremony. The trophy ceremony was not held It rained. (c) If I work out hard, then I am sore. If I am sore, I take an aspirin I did not take an aspirin I did not work out hard

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