1. Which of the following regular expressions best describes L(G), where G is the left-lineargrammar { S → Ab | Ba , A → a| Aa , B → b| Bb }?A. aa*b + bb*aB. ab* + ba*C. (a+b)(a* + b*)2. Given an NFA M with n states and an arbitrary string x of length p, determining whetheror not x is in L(M) can be done inA. O(n+p)В. О(2а + р)C. O(np)D. O(p")steps.3. What is the simplest regular expression equivalent to (a*b*c* + c*b*a*)* ?A. (a + b+ c)*B. (abc + cba)*C. It is already in its simplest form.4. What does the egrep pattern "b?[ab]{1,2}" translate into?A. (b + ɛ)(a + b+ aa + ab + ba + bb)B. (bal + bb1 + ba2 + bb2)C. (al + a2 + b1 + b2 + ba1 + ba2 + bb1 + bb2)

The answers for all mcqs with explanation given below

1. Which of the following regular expressions best describes L(G), where G is the left-linear grammar { S –→ Ab | Ba , A a | Aa , B → b | Bb }? A. aa*b + bb*a B. ab* + ba* C. (a+b)(a* + b*) 2. Given an NFA M with n states and an arbitrary string x of length p, determining whether or not x is in L(M) can be done in A. O(n+p) B. O(2ª + p) C. O(np) steps.

1. Which of the following regular expressions best describes L(G), where G is the left-linear grammar { S –→ Ab | Ba , A a | Aa , B → b | Bb }? A. aab + bba B. ab* + ba* C. (a+b)(a* + b*) 2. Given an NFA M with n states and an arbitrary string x of length p, determining whether or not x is in L(M) can be done in A. O(n+p) B. O(2ª + p) C. O(np) steps.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

100%

1. Which of the following regular expressions best describes L(G), where G is the left-linear
grammar { S → Ab | Ba , A → a| Aa , B → b| Bb }?
A. aa*b + bb*a
B. ab* + ba*
C. (a+b)(a* + b*)
2. Given an NFA M with n states and an arbitrary string x of length p, determining whether
or not x is in L(M) can be done in
A. O(n+p)
В. О(2а + р)
C. O(np)
D. O(p")
steps.
3. What is the simplest regular expression equivalent to (a*b*c* + c*b*a*)* ?
A. (a + b+ c)*
B. (abc + cba)*
C. It is already in its simplest form.
4. What does the egrep pattern "b?[ab]{1,2}" translate into?
A. (b + ɛ)(a + b+ aa + ab + ba + bb)
B. (bal + bb1 + ba2 + bb2)
C. (al + a2 + b1 + b2 + ba1 + ba2 + bb1 + bb2)

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