# q7-rev.pdf - Questions 1 Question 9.11(Solution p 3...

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Questions 1 Question 9.1–1: (Solution, p 3) Consider the following finite automaton. b b a a a. Check the strings that the automaton will accept. b bab a bbbb aba baba b. Give an English description of the set of strings accepted by this automaton. Question 9.1–2: (Solution, p 3) Draw a finite automaton that accepts all strings containing only a ’s and b ’s that begin in a . Question 9.1–3: (Solution, p 3) Consider the following finite automaton. a a a a b b b b Check the strings that are within the language accepted by this finite automaton. ab aabbb bbb bbbabb baaa aabaabaa abba Question 9.1–4: (Solution, p 3) Design a finite state automaton that will recognize the language of all strings containing only a ’s and b ’s where there are at least 3 b ’s.

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Questions 2 Question 9.2–1: (Solution, p 3) Consider the following Turing machine. (Note that the underscore represents a blank on the tape.) 0 2 3 1 4 a,b,_ a,b,_ a,b < _ < a > < b a,> b,> At right, diagram this Turing machine’s computation as it goes through the string ab . If you run out of blanks in the table, stop.
• Fall '15
• Narendragoel
• Alan Turing

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