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Assignment No. 01 
Total Marks: 20
Due Date: 17/05/2016 

Objectives: Objective of this assignment is to assess the understanding of students of Sets, Alphabets, Languages, Regular Expression and Finite Automata.
Instructions: Please read the following instructions carefully before submitting assignment:
Note: No assignment will be accepted after the due date through email in any case (load shedding, server down, internet malfunctioning etc.). It is recommended to upload solution file at least two days before its closing date.
For any query about the assignment, contact at cs402@vu.edu.pk
Question 1: Marks:5+5 10 Write regular expression for each of the following languages over alphabet set {a,b}.
I) Language of all those strings which end with substring ‘ab’ and have odd length. II) Language of all those strings which contain no more than two b’s.
Question 2: Marks: 10 You are required to construct an FA for the language of all those strings whose length is Odd, but contain even number of b’s defined over alphabet set {a,b}.


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Dear Students Don’t wait for solution post your problems here and discuss ... after discussion a perfect solution will come in a result. So, Start it now, replies here give your comments according to your knowledge and understandings....
I) Language of all those strings which end with substring ‘ab’ and have odd length.? plz send odd lenght
A string should be ended at ‘ab’ and should have odd length.
Regular expression for an odd length string is (a+b)((a+b)(a+b))* or ((a+b)(a+b))*(a+b)
By increment ab string in the end which have odd length.
(((a+b)((a+b)(a+b))*)+(((a+b)(a+b))*(a+b)))ab
but question no.1 ke second juz ka dia gram make make krna kiay,
by
mc160201929
Question 1: Marks:5+5 10
Write regular expression for each of the following languages over alphabet set {a,b}.
Language of all those strings which end with substring ‘ab’ and have odd length.
((ab+ba)(aa+bb)(ab+ba))*
Language of all those strings which contain no more than two b’s.
(a+b)(a+b)(a+b)*
Question 2: Marks: 10
You are required to construct an FA for the language of all those strings whose length is Odd, but contain even number of b’s defined over alphabet set {a,b}.
a a a
➡⭕➡⭕➡⭕➡©
b b b
Is an FA with odd length n even no.of strings defined over alphabet [a,b]
Its regular expression may be:
(a+b)(a+b)(a+b)
bro ye question no.1 ke second juz main dia gram make krna he
kia check example
Question 1: Marks:5+5 10
Write regular expression for each of the following languages over alphabet set {a,b}.
Language of all those strings which end with substring ‘ab’ and have odd length.
((ab+ba)(aa+bb)(ab+ba))*
Language of all those strings which contain no more than two b’s.
(a+b)(a+b)(a+b)*
Question 2: Marks: 10
You are required to construct an FA for the language of all those strings whose length is Odd, but contain even number of b’s defined over alphabet set {a,b}.
a a a
➡⭕➡⭕➡⭕➡©
b b b
Is an FA with odd length n even no.of strings defined over alphabet [a,b]
Its regular expression may be:
(a+b)(a+b)(a+b)
solve assignment of CS402 .
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