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A CFG is not closed under

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A CFG is not closed under

(a) Dot operation

(b) Union Operation

(c) Concatenation

(d) Iteration

This question was addressed to me in a job interview.

I'd like to ask this question from Ambiguous Grammar topic in section Context Free Grammars and Languages of Automata Theory

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Best answer
Right choice is (d) Iteration

For explanation: The closure property of a context free grammar does not include iteration or kleene or star operation.

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