Exam (elaborations)
COS1501 Assignment 2 2024 (653506) - 14 June 2024
- Institution
- University Of South Africa (Unisa)
COS1501 Assignment 2 2024 (653506) - 14 June 2024 QUESTIONS WITH ANSWERS
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COS1501 Assignment 22024 (653506) - 14
June 2024
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, COS1501 Assignment 2 2024 (653506) - 14 June 2024
Question 1: Venn Diagram for [(A ⋂ B)' - C] ⋂ [(A + B) - C]
To solve this, let's break down the expression step by step and draw the Venn diagrams accordingly:
1. [(A ⋂ B)' - C]:
o First, find the complement of A∩BA \cap BA∩B: This is everything outside A∩BA \cap BA∩B.
o Subtract CCC from this complement.
2. [(A + B) - C]:
o Find A+BA + BA+B, which is A∪BA \cup BA∪B.
o Subtract CCC from A∪BA \cup BA∪B.
Combining these two results using intersection gives us the desired set.
Since I don't have the Venn diagrams to choose from (options a, b, c, d), you would need to refer to those to
identify which diagram correctly represents the set.
Question 2: Counterexample for (A - B) U C' = (C' - B) + A
To find a counterexample:
• Substitute each given set of A,B,A, B,A,B, and CCC into both sides of the equation.
• Check if both sides are equal for any given set. If they are not equal for one set, that set is a valid
counterexample.
Let's go through the options:
• Option a: A = {1}, B = {2}, C = {3}
• Option b: A = {1}, B = {1}, C = {2}
• Option c: A = {1, 2}, B = {1, 2}, C = {3}
• Option d: A = {3}, B = {3, 4}, C = {4}
Substitute these into the equation to find the counterexample.
Question 3: Valid steps 4 and 6 in the proof
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