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# CS402 Theory of Automata Assignment No 01 Solution & Discussion Spring 2019 Due Date : 13-05-2019

CS402 Theory of Automata Assignment No 01 Solution & Discussion Spring 2019 Due Date : 13-05-2019

Question No 1: Marks:5
Construct a regular expression (RE) defining each of the following languages over the alphabet
∑={a b}:

All words ends in 3 consecutive b.
All words having at least one ‘a’

Question No 2: Marks=5+5=10
Construct an FA which recognizes the set of all strings defined over S = {x, y} starting with the prefix ‘xy’.

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any one has idea how to make regular expression of FA in 2nd question?

according me

RE will be

(x+y)*(xx+yy)

is it correct or not

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