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hw1_solutions

# hw1_solutions - CS40 HW1 Solution Grading Policy 1 2 points...

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CS40 HW1 Solution August 10, 2009 Grading Policy 1. 2 points for each small question from #1 to #7 and #9. 10 points for the proof of #8. 2. 8 points for clearance. 3. totally 100 pts. 1 Section 1.1 problem 18, 14 points a) The necessary condition is the conclusion: If you get promoted, then you wash the boss’s car. b) If the winds are from the south, then there will be a spring thaw. c) The sufﬁcient condition is the hypothesis: If you bought the computer less than a year ago, then the warranty is good. d) If Willy cheats, then he gets caught. e) The "only if" condition is the conclusion: If you access the website, then you must pay a subscription fee. f) If you know the right people, then you will be elected. g) If Carol is on a boat, then she gets seasick. 2 Section 1.1 problem 28, 12 pts a) and b) p ¬ p p → ¬ p p ↔ ¬ p T F F F F T T F DNF of a): ¬ p c) and d) p q ··· p ( p q ) ( p q ) ( p q ) T T ··· F T T F ··· F T F T ··· T T F F ··· F T 1

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hw1_solutions - CS40 HW1 Solution Grading Policy 1 2 points...

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