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The union of two sets contains all the elements contained in either set (or both sets).

The union is notated  B.

More formally, ∊ ⋃ B if ∊ A or ∊ B (or both)

The intersection of two sets contains only the elements that are in both sets.

The intersection is notated  B.

More formally, ∊ ⋂ B if ∊ A and ∊ B

The complement of a set A contains everything that is not in the set A.

The complement is notated A’, or Ac


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