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If L1 and L2 are context free languages, which of the following is context free?(a) L1*(b) L2UL1(c) L1.L2(d) All of the mentionedI have been asked this question in semester exam.The query is from Sentential Forms topic in chapter Context Free Grammars and Languages of Automata Theory

Answer»

Right choice is (d) All of the mentioned

Easy explanation: The following is a THEOREM which states the CLOSURE property of context FREE languages which INCLUDES Kleene operation, Union operation and DOT operation.



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