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Is empty string a valid input in Ndfa.

True

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MCQ

Find the wrong statement?

The language accepted by finite automata are the languages denoted by regular expression

Every DFA has a regular expression denoting its language

For a regular expression r, there does not exists NDFA with L

None of the mentioned

Discussion

MCQ

The definition of a language L with alphabet {a} is given as following. L = { ank | k > 0, and n is a positive integer constant} What is the minimum number of states needed in a DFA to recognize L?

k+1

n+1

2n+1

2k+1

Discussion

MCQ

Can a DFA simulate NDFA?

Yes

Sometimes

Depends on NDFA

Discussion

MCQ

Which of the following problems occur?

i) Does a given program ever produce an output?
ii) If L is a CFL, then is L



            
                                                            
                            
                            A
                            
                                i, ii, iii, iv                            
                        
                                            
                            
                            B
                            
                                i, ii                            
                        
                                            
                            
                            C
                            
                                ii, iii, iv                            
                        
                                            
                            
                            D
                            
                                iii, iv                            
                        
                                                

            
                Correct Answer: D
                i) Is a variation of Turing Machine Halting problem and it is undecidable.



        
            
            
                            
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                MCQ            
            
        

        
            
                5.
                What is the relation between NFA-accepted languages and DFA accepted languages?
            

            
                                                            
                            
                            A
                            
                                >                            
                        
                                            
                            
                            B
                            
                                <                            
                        
                                            
                            
                            C
                            
                                <                            
                        
                                            
                            
                            D
                            
                                <=                            
                        
                                                

            
                Correct Answer: C
                The no of languages accepted by NFA and DFA is equal.
            
        

        
            
            
                            
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