Set, it is a collection of objects, people or numbers with a common characteristic, Equal Set, Contain the exact same elements, Union Set (⋃), It is the set of elements in the all the sets together , Intersection (⋂), set of elements that are common to both sets, Subset , If all elements in Set B are contained in Set A, Universal Set, Denoted by a box around the sets and the capital letter U, A', A compliment - all elements in the sets but not in Set A, Cardial Number symbol, # , Number of elemets in a set is called , cadrinal number, Element symbol, ∈, things that are in a set, elements, Null set , the empty set, is the set that does not contain anything, Symbol for null set, { } or ∅, Venn diagram, a series of overlapping circles usually 2 or 3.

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