McqMate

Q. |
## 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? |

A. | aaa |

B. | aba |

C. | abab |

D. | aa |

Answer» C. abab |

3.6k

0

Do you find this helpful?

22

View all MCQs in

Theory of ComputationNo comments yet

- 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?
- Let L be any infinite regular language, defined over an alphabet Σ then there exist three strings x, y and z belonging to Σ such that all the strings of the form XY^ n Z for n=1,2,3, … are the words in L called
- 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.
- How many strings of length less than 4 contains the language described by the regular expression (x+y)*y(a+ab)*?
- Let L={w (0 + 1)* w has even number of 1s}, i.e. L is the set of all bit strings with even number of 1s. Which one of the regular expression below represents L?
- The regular expression have all strings in which any number of 0’s is followed by any number of 1’s followed by any number of 2’s is :
- Let L be a language defined over an alphabet ∑,then the language of strings , defined over ∑, not belonging to L denoted by LC or L. is called :
- How many states are present in the minimum state finite automaton that recognizes the language represented by the regular expression (0+1)(0+1)…..N times?
- If L1 and L2 are context free language and R a regular set, then which one of the languages below is not necessarily a context free language?
- If a language is denoted by a regular expression L = ( x )* (x y x ), then which of the following is not a legal string within L ?