UNISA 2023 COS1501-23-Y Welcome Message Assessment 2
QUIZ
Started on Monday, 19 June 2023, 3:30 PM
State Finished
Completed on Monday, 19 June 2023, 8:26 PM
Time taken 4 hours 56 mins
Marks 20.00/20.00
Grade 100.00 out of 100.00
Question 1 Let A, B and C be subsets of a universal set U.
Correct
Which one of the following four Venn diagrams presents the set [(A ⋂ B)’ – C] ⋂ [(A +
Mark 1.00 out of B) – C]?
1.00
(Hint: Draw the Venn diagrams for [(A ⋂ B)’ – C] ⋂ [(A + B) – C] step by step).
a.
b.
c.
https://mymodules.dtls.unisa.ac.za/mod/quiz/review.php?attempt=11364672&cmid=618677 2023/10/31, 9 09 AM
Page 1 of 11
:
, d.
Refer to study guide, pp 50, 51.
The correct answer is:
Question 2 Let A, B and C be subsets of a universal set U = {1, 2, 3, 4}.
Correct The statement (A – B) U C’ = (C’ – B) + A is NOT an identity.
Mark 1.00 out of Which of the following sets A, B and C can be used in a counterexample to prove that
1.00 the given statement is not an identity?
(Hint: substitute the given sets for LHS and RHS separately)
a. A = {1}, B = {2} and C = {3}
b. A = {1}, B = {1} and C = {2}
c. A = {1, 2}, B = {1, 2} and C = {3}
d. A = {3}, B = {3, 4} and C = {4}
Refer to study guide, pp 60, 61.
The correct answer is: A = {1}, B = {2} and C = {3}
https://mymodules.dtls.unisa.ac.za/mod/quiz/review.php?attempt=11364672&cmid=618677 2023/10/31, 9 09 AM
Page 2 of 11
:
QUIZ
Started on Monday, 19 June 2023, 3:30 PM
State Finished
Completed on Monday, 19 June 2023, 8:26 PM
Time taken 4 hours 56 mins
Marks 20.00/20.00
Grade 100.00 out of 100.00
Question 1 Let A, B and C be subsets of a universal set U.
Correct
Which one of the following four Venn diagrams presents the set [(A ⋂ B)’ – C] ⋂ [(A +
Mark 1.00 out of B) – C]?
1.00
(Hint: Draw the Venn diagrams for [(A ⋂ B)’ – C] ⋂ [(A + B) – C] step by step).
a.
b.
c.
https://mymodules.dtls.unisa.ac.za/mod/quiz/review.php?attempt=11364672&cmid=618677 2023/10/31, 9 09 AM
Page 1 of 11
:
, d.
Refer to study guide, pp 50, 51.
The correct answer is:
Question 2 Let A, B and C be subsets of a universal set U = {1, 2, 3, 4}.
Correct The statement (A – B) U C’ = (C’ – B) + A is NOT an identity.
Mark 1.00 out of Which of the following sets A, B and C can be used in a counterexample to prove that
1.00 the given statement is not an identity?
(Hint: substitute the given sets for LHS and RHS separately)
a. A = {1}, B = {2} and C = {3}
b. A = {1}, B = {1} and C = {2}
c. A = {1, 2}, B = {1, 2} and C = {3}
d. A = {3}, B = {3, 4} and C = {4}
Refer to study guide, pp 60, 61.
The correct answer is: A = {1}, B = {2} and C = {3}
https://mymodules.dtls.unisa.ac.za/mod/quiz/review.php?attempt=11364672&cmid=618677 2023/10/31, 9 09 AM
Page 2 of 11
:
