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ISRO | ISRO CS 2015 | Question 43
  • Last Updated : 04 Apr, 2018

Let R1 and R2 be regular sets defined over the alphabet, then
(A) R1 ∩ R2 is not regular
(B) R1 ∪ R2is not regular
(C) Σ * – R1 is regular
(D) R1 * is not regular

Answer: (C)

Explanation: Regular languages are closed under Union (∪), Intersection (∩) and Kleene Closure (*), which make options (A), (B) and (D) incorrect.
Option (C): Σ* – R1 = Σ* ∩ R1’= Regular languages are closed under complement operation, it is regular. So, option (C) is correct.

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