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Sets

A set is a collection of objects, and the objects are called elements of the set. You may be asked to form the union of two sets, which contains all the objects from either set. You may also be asked to form the intersection of two sets, which contains only the objects that are in both sets.
For example, if Set A = {1, 2, 5} and Set B = {5, 10, 21}, then the union of sets A and B would be {1, 2, 5, 10, 21} and the intersection would be {5}.




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