A certain event is any event that will definitely happen.
For example, the sunrise tomorrow is something that is certain to happen (although it might be obscured from view by rain, snow, fog or something else); this will certainly happen.
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It is the probability of an event which is certain to happen.
No; if it is certain not to occur the probability is 0.
It means the event is certain to happen.
Theoretical probability of 1 refers to an event that is certain to happen. It has a probability of 1 because it is guaranteed to occur.
Its probability.