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Regular Expressions Questions

MCQ
61.
If P, Q, R are three regular expressions and if P does not contain a then the equation R = R + RP has a unique solution given by?
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MCQ
62.
If L1 and L2 are regular languages is/are also regular language(s).
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MCQ
63.
Which of the following regular expression denotes zero or more instances of an a or b?
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MCQ
64.
The string (a)|((b)*(c)) is equivalent to ______________
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