**The Department of Mathematics Education. EMAT 6700
J. Wilson**

**Finding Probabilities of Compound
Events**
Some events are expressed as the outcomes
that are (a)complement event, or (b) disjoint events, or (c) intersection
and union of events. We'll next see how to calculate probabilities
for these three cases.

__Complement of an Event__
The *complement of an event*
A consists of all outcomes in the sample space that are not in
A. Ii is denoted as . The probability
of relates to the probability of
A by:

__Disjoint Events__
The two events, A and B, are *disjoint*
if they do not have any common outcomes.

__The Intersection and Union of
Two Events.__
The *intersection* of A
and B consists of outcomes that are in both A and B.
The** ***union** *of A
and B consists of outcomes in A or B. We use "A or B"
to denote that either A occurs, or B occurs, or both occur.

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