Due February 11, 1999

1. We will finish up the part of the course devoted to logic and critical thinking this week. Please finish reading all four units of Chapter 1. One of the central ideas of this chapter is the analysis of deductive arguments and the distinction between valid/invalid arguments and sound/unsound arguments. If you have trouble with these ideas, please ask in class or see me in office hours.

2. Please do the following problems from the book. Remember that the problems listed below are a minimum recommended dose. You should do more if you need more practice!

Unit 1C: 1, 4, 8, 21, 23, 38.
Unit 1D: 1, 13, 15, 17

Just For Fun

A jailer has three white hats, two red hats, and three prisoners, one of whom is blind. Each prisoner is given a hat and told he will be freed if he can deduce the color of his hat. Prisoners 1 and 2 cannot determine the color of their hats. Having heard the responses of the other two prisoners, the blind Prisoner 3 correctly determines the color of his hat and is freed. How did he do it and what color is his hat?