Which of the following statements is/are correct? I. The language L accepts all the strings of a's and b's where the third symbol from left end is b. The regular expression for L is (a +b)* b(a +b)* . II. The language L accepts all the strings of a's and b's where the number of a's in a string is divisible by 3. The regular expression for L is (b* ab* ab* ab*)*. III. The regular expression R=(a+b)" . The number of states required to construct the minimal DFA for the regular expression R is n+2.

C++ Programming: From Problem Analysis to Program Design
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ISBN:9781337102087
Author:D. S. Malik
Publisher:D. S. Malik
Chapter7: User-defined Simple Data Types, Namespaces, And The String Type
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Which of the following statements is/are correct?
I. The language L accepts all the strings of a's and b's where the third symbol from left end is b.
The regular expression for L is (a + b) b(a + b)*.
II. The language L accepts all the strings of a's and b's where the number of a's in a string is
divisible by 3. The regular expression for L is (b* ab* ab* ab* )*.
III. The regular expression R=(a+b)“ . The number of states required to construct the minimal
DFA for the regular expression R is n+2.
(A) I and II
(B) I and III
(C) II and III
(D) All are correct
Transcribed Image Text:Which of the following statements is/are correct? I. The language L accepts all the strings of a's and b's where the third symbol from left end is b. The regular expression for L is (a + b) b(a + b)*. II. The language L accepts all the strings of a's and b's where the number of a's in a string is divisible by 3. The regular expression for L is (b* ab* ab* ab* )*. III. The regular expression R=(a+b)“ . The number of states required to construct the minimal DFA for the regular expression R is n+2. (A) I and II (B) I and III (C) II and III (D) All are correct
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