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If A and B are regular languages, !(A’ U B’) is:(a) regular(b) non regular(c) may be regular(d) none of the mentionedThis question was addressed to me during an interview.The origin of the question is Closure Properties under Boolean Operations in chapter Properties of Regular Languages of Automata Theory

Answer» CORRECT choice is (a) regular

The BEST I can explain: If A and B are regular LANGUAGES, then A Ç B is a regular LANGUAGE andA ∩ B is equivalent to!(A’ U B’).


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