Keep in mind 1. a certain event is an event whose probability = 1 always.2. the event is an event that is not possible with probability = 0.3. the probability of any value will be no less than 1 and not more than 0 always.4. in an experiment, one can cause the effect that you want to have the same opportunities and a chance to be A number of things and events, there are N members is n, so the probability of A is.
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