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Sets
A set is a collection of elements or numbers or objects, represented within the curly brackets { }. For example: {1,2,3,4} is a set of numbers. There are three forms in which we can represent the sets. They are: Statement form: A set of even number less than 20 Roster form: A = {2,4,6,8,10,12,14,16,18} Set builder form: A = {x: x=2n, n ∈ N and 1 ≤ n ≤ 20}
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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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