the extent to which something is probable; the likelihood of something happening or being the case.
the chance that something will happen
the likelihood of an event occurring
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It is the set of all possible outcomes.
It is the space consisting of all possible outcomes of the experiment.
Probability model
A probability of 0 means the event is impossible.
The probability is 1:1 (1 in 1) or 100% (by calendar definition).