Do all of the following questions or as much as possible Note that in questions below na(w) and n,(w) indicate the number of a's and the number of b'sin string w.1. Find a regular expression for the following languages over E= {a,b}"(a) {w : w does not contain substring bbb}(b) {w : w contains exactly three a's and it ends with abb}(c) {w: na(w) mod 3 = 0 and w begins with ab}(d) {w : (na(w) + no(w)) mod 3 2 2}(e) {w : |w| mod 2 = 0}(f) L = {amb" : mn > 4}2. Find an NFA that accepts the language defined by the following regular expressionab(a + ab)*(a + aa*) + (abab)* + (aaa* + b)*3. Find a regular expression for the following regular languages(a) {w : 2na(w) + 3n,(w) is even}(b) {w : (na(w) – n,(w)) mod 3 = 1}4. Find a regular grammar for the following languages(a) L(aa" (ab+ a)*)(b) L((aab* ab)*)(c) L ={w : (na(w) – ni(w)) mod 3 = 1}5. Prove that the following langauges are not regular(a) L = {ww: w E {a,b}*}(b) L = {a"b* : n 2 k}(c) L = {a"b* : n+m > k > 0}(d) L = {w e {a, b}" : 2n.(w) = 3n,(uw)}%3D

NOTE: As per rules we are allowed to solve the first 3 subquestion. a. {w: w does not contain…

Note that in questions below na(w) and n,(w) indicate the number of a's and the number of b's in string w. 1. Find a regular expression for the following languages over E= {a,b}" (a) {w : w does not contain substring bbb} (b) {w : w contains exactly three a's and it ends with abb} (c) {w: na(w) mod 3 = 0 and w begins with ab} (d) {w: (na(w) + ns(w)) mod 32 2} (e) {w : |w| mod 2 = 0} (f) L= {a™b" : mn > 4} %3D %3D

Note that in questions below na(w) and n,(w) indicate the number of a's and the number of b's in string w. 1. Find a regular expression for the following languages over E= {a,b}" (a) {w : w does not contain substring bbb} (b) {w : w contains exactly three a's and it ends with abb} (c) {w: na(w) mod 3 = 0 and w begins with ab} (d) {w: (na(w) + ns(w)) mod 32 2} (e) {w : |w| mod 2 = 0} (f) L= {a™b" : mn > 4} %3D %3D

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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