Which of the following regular expressions recognizes the language of all strings from {a,b} * such that the number of as is 2 mod 4 ( {w]w € {a,b}*, # _(w) mod 4 = 2}). a O a. b* ab* ab* + aa*b*aa*b* O b. b* aab ○ c. b* ab * ab * (b* ab*ab* ab* ab *) * O d. b* ab *a(a+b)*+b*ab* ab * ab *a(a+b) *

Which of the following regular expressions recognizes the language of all strings from {a,b} * such that the number of as is 2 mod 4 ( {w]w € {a,b}, # _(w) mod 4 = 2}). a O a. b ab* ab* + aabaab O b. b* aab ○ c. b* ab * ab * (b* abab ab* ab ) O d. b* ab a(a+b)+bab ab * ab a(a+b)

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

Which of the following regular expressions recognizes the language of all strings from {a,b} * such that the number of as is 2 mod 4 (
{w/w = {a,b}*, # _(w) mod 4 = 2}).
a
*
*
a. b* ab * ab + aa *b aa b
*
b. b* aab*
*
*
c. b * ab * ab * (b* ab * ab* ab * ab *)
O d. b* ab *a(a+b) * + b* ab* ab* ab *a(a+b)

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