Which of the following are regular sets?

Related Questions

• Let P be a regular language and Q be context-free language such that Q ∈ P. (For example, let P be the language represented by the regular expression p*q* and Q be {pnqn n∈ N}). Then which of the following is ALWAYS regular?
• A language is represented by a regular expression (a)*(a + ba). Which of the following strings does not belong to the regular set represented by the above expression?
• Which of the following are decidable? 1) Whether the intersection of two regular language is infinite. 2) Whether a given context free language is regular. 3) Whether two push down automata accept the same language. 4) Whether a given grammar is context free.
• Languages are proved to be regular or non regular using pumping lemma.
• The regular sets are closed under:
• Which of the following is true with respect to Kleene’s theorem? 1 A regular language is accepted by a finite automaton. 2 Every language is accepted by a finite automaton or a turingmachine.
• Which of the following is not a regular expression?
• Which one of the following languages over the alphabet {0,1} is described by the regular expression: (0+1)*0(0+1)*0(0+1)*?
• Which one of the following statement is true for a regular language L over {a} whose minimal finite state automation has two states?
• Which of the following regular expression identity is true?