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Intersection and Union The intersection of two sets is the set of elements that are common to both sets. The symbol ∩ is used to represent intersection. The union of two sets is the set of elements that are in one or the other of the sets. The symbol U is used to represent union.

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Consider how two streets come together to demonstrate these concepts. The intersection of the two streets is the portion of pavement that is common to both. Harmony Street Shields Street

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The union of the two streets is the portion of pavement that is on one street or the other. Harmony Street Shields Street

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The union of the two streets is the portion of pavement that is on one street or the other. Harmony Street Shields Street Note that this includes the intersection which is on both streets.

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When working with and, think intersection. AndOr Intersection

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When working with or, think union. AndOr IntersectionUnion

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Section 1.2 – 1.3 Outline Intersection Disjoint Sets (A B= ) AND Union OR Universe The set of items that are possible for membership Venn Diagrams.

Section 1.2 – 1.3 Outline Intersection Disjoint Sets (A B= ) AND Union OR Universe The set of items that are possible for membership Venn Diagrams.

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