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If P, Q, R are three regular expressions and if P does not contain a then the equation R = R + RP has a unique solution given by?

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If P, Q, R are three regular expressions and if P does not contain a then the equation R = R + RP has a unique solution given by?

(a) R = QP*

(b) R = P*Q

(c) R = RP

(d) None of the mentioned

I had been asked this question in examination.

Question is taken from Obtaining the regular Expression from the Finite automata in portion Finite Automata and Regular Expression of Compiler

1 Answer

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Correct choice is (a) R = QP*

Explanation: It is an important law primarily used in conversion.

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