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If L1′ and L2′ are regular languages, then L1.L2 will be

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in Automata Theory by (51.1k points)
If L1′ and L2′ are regular languages, then L1.L2 will be

(a) regular

(b) non regular

(c) may be regular

(d) none of the mentioned

The question was asked during an interview.

I would like to ask this question from Closure Properties under Boolean Operations topic in portion Properties of Regular Languages of Automata Theory

1 Answer

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Best answer
Correct option is (a) regular

The explanation: Regular language is closed under complement operation. Thus, if L1′ and L2′ are regular so are L1 and L2. And if L1 and L2 are regular so is L1.L2.

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