Exam (elaborations)
COS3701 EXAM PACK 2025 {DETAILED QUESTIONS AND ANSWERS }
- Institution
- University Of South Africa
COS3701 EXAM PACK 2025 {DETAILED QUESTIONS AND ANSWERS }
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DETAILED QUESTIONS AND
ANSWERS COMPILED FROM
RECENT EXAM PAST PAPERS
FOR EXAM PREPARATION.
SUCCESS IN YOUR
EXAMINATION
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UNIVERSITY EXAMINATIONS
Jan/Feb 2023
COS3701
Theoretical Computer Science III
80 Marks
Duration 2 Hours
Welcome to the COS3701 exam.
Examiner name: Ms DR Mokwana
Internal moderator name: Prof F Bankole
This paper consists of 5 pages.
Instructions:
• Upload you answer script in a single PDF file format
not password protected
• No emailed scripts
Downloaded bywill be marked
palmer kamulee (kamuleepalmer@gmail.com)
, lOMoAR cPSD| 47715245
COS3701
Jan/Feb 2023
• Preview your submission to ensure legibility and
correct script file has been uploaded
• Students who have not utilised IRIS invigilation app
will be subjected to disciplinary process
• Students suspected of dishonesty conduct during
examination will be subjected to disciplinary process
• Write neatly and legibly
• The mark for each question is in brackets next to the
question
Question 1 [16]
(a) Determine a regular expression for the language L over the
alphabet {a, b} that consists of all words that have at least
one b but contain exactly one aa substring (and no other as).
Example of words in the language are aab, bbbaabbb,
bbbbaabbbbbbbb etc.
Examples of words that are not in the language are a, aba,
bbab, aaabbbb, baabbbbaabb
etc. (2)
(b)Design a deterministic finite automaton (DFA) that will
recognise all of the words in L
as defined above. (4)
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