Union, intersection and complement

Union, intersection and complement

Secondary 3
TGM Original Questions
SetMembership rule
\(A\cap B\)In both A and B.
\(A\cup B\)In A or B, including both.
\(A'\)In \(\xi\) but not in A.
\(A\cap B'\)In A but not in B.

For a combined expression, use the brackets first. The set \((A\cup B)'\) contains elements in neither A nor B. The set \((A\cap B)'\) contains elements that are not in both; this includes elements in just one set.

A complement depends on the universal set. Always identify the universe before listing a complement or shading outside a circle.

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