11 HL: Proof by Exhaustion & Proof by Counterexample

Complete (a significant number of) the following questions before our next class. (Try at least a few from each section.)

(from last class)
Exercise 9B questions 1, 2, 3, 5, 9
Exercise 9C questions 1, 3, 4, 6, 8
Exercise 9D questions 2b, 4, 7

(new material below)
Exercise 9E questions 3, 6, 7
Exercise 9F questions 1, 2, 4

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