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Odds
Sometimes, probabilities are stated in terms of odds , the ratio of the probability of the event’s occurring to the probability of its not occurring.
Example:
Suppose you roll a six-sided die. Find the odds that you roll a number greater than four.
There are two favorable outcomes ( and ), and four unfavorable outcomes . So the odds are
,
or "one-to-two odds" that you will roll a number greater than four.