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L and ~L are recursive enumerable then L is

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L and ~L are recursive enumerable then L is

(a) Regular

(b) Context free

(c) Context sensitive

(d) Recursive

I had been asked this question in an interview.

My query is from Regular Language & Expression in portion Regular Expressions and Languages of Automata Theory

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Correct choice is (d) Recursive

Explanation: If L is recursive enumerable and its complement too if and only if L is recursive.

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