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Regular Languages are not closed under ______ operator.

  1. Union
  2. Concatenation
  3. Subset
  4. Division
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1. Language anbn is subset of a*b*  but anbis not regular, hence regular is not closed under Subset operation
2.  Σ* is regular language and every language is subset of Σ*, but all languages are not regular

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can u pls give me any example for divison operation!
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