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MCQ

Which of the following regular expression denotes zero or more instances of an a or b?

a/b

(a/b)*

(ab)*

a*Ib

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Which of the following regular expression denotes zero or more instances of an a or b?

a/b

(a/b)*

(ab)*

a*Ib

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If is a language, and is a symbol, then, the quotient of and, is the set of strings such that is in: is in. Suppose is regular, which of the following statements is true?

L/a is always a regular language

L/a is not a regular language

Both of the mentioned

None of the mentioned

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The classes of languages P and NP are closed under certain operations, and not closed under others. Decide whether P and NP are closed under each of the following operations.
1. Union

2. Intersection

3. Intersection with a regular language

4. Kleene closure (star)

5. Homomorphism

Inverse homomorphisma) P is not closed under union

NP is not closed under intersection.

None of the mentioned

Both of the mentioned

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An individual token is called ________

Lexeme

Lex

Lexeme & Lex

None of the mentioned

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