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# slides7-4up - Combinatorics: Putting the Q in QS Starting...

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Compsci 82, Fall 2011 7.1 Combinatorics: Putting the Q in QS First, what's up with this? http://timesofindia.indiatimes.com/topic/Owen-Astrachan/videos Second what's the significance of the URL? http://www.youtube.com/watch?v=avkjb9F640k How many URLs in the same pattern? What's needed to answer this question? Why is this funny, or is it? Compsci 82, Fall 2011 7.2 Starting from first principles Two letter URLs. AA, AB, AC, …, ZX, ZY,ZZ all upper case letters, how many total? 26 starting with 'A', 26 starting with 'B', … What's the total? Suppose upper and lower case? 52 start with 'A' What's the total What happens if we have three letter URLs? How many start with 'A'? What's the total? We have an N-letter URL where each character takes on one of V values? Compsci 82, Fall 2011 7.3 Question interlude See questions from 2010 final How do you answer the Qish questions? See questions from 2009 final

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slides7-4up - Combinatorics: Putting the Q in QS Starting...

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