3..) Thank you in advance for your quick response.Subject - theory of computing. Please see the attached problems 1. Describe the language, over alphabet E = {a,b}, that the following CFGgenerates by giving a language defining expression or an Englishlanguage description.S> Xaaax | XbbbxX> ax | bx | A2. Find a CFG for the language of words, over alphabet E = {a,b}, that startwith a, end with a and contain two b's; or start with b, end with b andcontain two a's.3. Prove that the following grammar is ambiguous by drawing twodifferent parse trees of the same wordS> asbs | as | alb

Answer: Let the word is "aaabb"

Answered: 3. Prove that the following grammar is…

3. Prove that the following grammar is ambiguous by drawing two different parse trees of the same word S> asbs | as | 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

3..) Thank you in advance for your quick response.

Subject - theory of computing.

Please see the attached problems

1. Describe the language, over alphabet E = {a,b}, that the following CFG
generates by giving a language defining expression or an English
language description.
S> Xaaax | Xbbbx
X> ax | bx | A
2. Find a CFG for the language of words, over alphabet E = {a,b}, that start
with a, end with a and contain two b's; or start with b, end with b and
contain two a's.
3. Prove that the following grammar is ambiguous by drawing two
different parse trees of the same word
S> asbs | as | alb

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