Unions and Intersections of Sets

1
Section 3.2

• Unions and Intersections of Sets

2
Compound Events

• A compound event is the composition of two or
  more other events. Compound events may be formed
  by the union or the intersection of two events.

3
Union of Two Events

• The union of two events A and B is the event that
  occurs if either A or B or both occur on the
  performance of the experiment. A U B consists of
  all sample points that are in either A or B or
  both.
• Demo -Union of Two Events

4
Intersection of Two Events

• The intersection of two events A and B is the
  event that occurs if both A and B occur on a
  single performance of the experiment. We write
  AnB for the intersection of a and B. AnB
  consists of all sample points that belong to both
  A and B.
• Demo _Intersection of Two Events

5
Complementary Events

• The complement of event A is the event that A
  does not occur that is, the event consisting of
  all sample points that are not in A. We denote
  the complement of A as A' or as A
• Demo of A complement
• P(A)P(A)1