Free practice on Sets and Logic for Class 4, following the Cameroon primary school curriculum (English subsystem). Every answer is explained, so a parent who is not sure of the answer can still help.
A = {1, 2, 3} and B = {3, 4, 5}. What is the intersection of A and B?
Answer: B. {3}
The intersection holds only what is in BOTH sets.
A = {1, 2} and B = {3, 4}. What is the union of A and B?
Answer: C. {1, 2, 3, 4}
The union puts all the members together.
Sets {a, b, c} and {x, y, z} have the same number of members. They are:
Answer: B. equivalent sets
Equivalent sets have the same number of members; equal sets have exactly the same members.
Which symbol means 'is an element of'?
Answer: A. ∈
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