Video Lesson - Union and Intersection of Sets
Union
The union of two or more sets is the set that contains all of the
elements of the two original sets. The union of two sets A and B
is symbolized this way: A U B .
For example, the union of the sets A = {1, 2, 3, 4, 5} and B
= {4, 5, 6, 7, 8} is
A U B = {1,2,3,4,5,6,7,8}
This set contains every element that is in either set. If x is an element
of A U B then it must be an element of A, or of B, or of both.
Intersection
The intersection of two sets is the set of their overlapping elements.
The intersection of the two sets A and B is symbolized as A n B
The intersection of the sets A = {1, 2, 3, 4, 5} and B = {4, 5, 6,
7, 8}, for example, is A n B = {4,5}. If x is an element of A n B then x
must be an element of both A and B.
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