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Simple Probability
 

Probability

 
 

Terms

 
Event  -  A subset of the outcomes of a process. For instance, the set of outcomes {2, 4, 6} when rolling a die is an event that one might call "rolling an even number".
 
Complementary Events  -  Events whose probabilities add up to 1. Two events are complementary when one event occurs if and only if the other does not.
 
Odds  -  The ratio of the probability of an event to the probability of its complement; i.e., the ratio of favorable outcomes to unfavorable outcomes.
 
Outcomes  -  The possible results of an event. For example, when a die is rolled, the possible outcomes are 1, 2, 3, 4, 5, and 6.
 
Probability  -  A measure of the likeliness that an event will happen.

Probability =    

 
 
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