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Which of the following methods is suitable for conversion of DFA to RE?

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Which of the following methods is suitable for conversion of DFA to RE?

(a) Brzozowski method

(b) Arden’s method

(c) Walter’s method

(d) All of the mentioned

This question was addressed to me during an online interview.

The origin of the question is Conversion by Eliminating states in division Regular Expressions and Languages of Automata Theory

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The correct option is (a) Brzozowski method

The explanation: Brzozowski method takes a unique approach to generating regular expressions. We create a system of regular expressions with one regular expression unknown for each state in M, and then we solve the system for Rλ where Rλ is the regular expression associated with starting state qλ.

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