EXERCISE 1.11. 3: Proving arguments in English are valid using rules of inference Prove that each argument is valid by replacing each proposition with a variable to obtain the form of the inference to prove that the form is valid. 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 If it was not foggy or it didn't rain (or both), then the race was held and there was a troply ceremony The trophy ceremony was not held .. It rained (b) If I work out hard, then am sore If I am sore, I take an aspirin did not take an aspirin. ,'. I did not work out hard (c)