3-8 Unions and Intersections of Sets

Objective

To find the unions and intersections of sets

Image Long Description

Certain regions of the Venn diagram in the Solve It show unions and intersections of sets.

Essential Understanding Given two or more sets, you can describe which elements belong to at least one set. You can also describe which elements belong to all of the sets. You use symbols to represent these relationships.

The union of two or more sets is the set that contains all elements of the sets. The symbol for union is ∪ . union .  To find the union of two sets, list the elements that are in either set, or in both sets. An element is in the union if it belongs to at least one of the sets. In the Venn diagram below, A ∪ B eh union b  is shaded.

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