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sample2 - Faculty of Arts and Science School of Computing...

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Faculty of Arts and Science School of Computing CISC223 Sample Midterm Examination 2 Instructor: D.B. Skillicorn Fall Term 2010 Instructions : 1. You have fifty minutes. Attempt all questions. 2. You may bring in one 8.5x11 sheet of paper containing notes, and use it during this midterm. 3. Answer questions on the examination paper. Nothing else will be marked. Use the amount of space under each question as a guide to the detail of your answer. You may use scrap paper and the back of the examination paper pages for rough working. 4. It is difficult to answer your questions without revealing something that might give you an unfair advantage. So you’re welcome to ask, but I will often have to respond that I can’t answer your question. 5. Make sure your name is on every page of the examination paper. 6. Each question is labelled with the number of minutes it should take you. The total for this exam is 50 marks. The midterm counts for 10% of your final grade. NAME: STUDENT NUMBER
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Student number: Page 2 of 4 1. (15 minutes) The Pumping Lemma for context-free languages in the text book is stronger than the one we proved in class – it contains an extra restriction on the string w that the length of vxy (in the class notation) is no greater than m n where m
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