sparknotes
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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