There are two main ways:
One is to calculate the theoretical probability. You will need to develop a model for the experiment and then use the laws of science and mathematics to determine the probability of the event (subject to the model's assumptions).
A major alternative is the empirical or experimental method. This requires performing the trial many times. The probability of the event is estimated by the proportion of the total number of trials which result in the outcome of interest occurring.
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It is the probability of an event that will definitely happen.
If the probability of an event is zero then that event cannot happen
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For any event A, Probability (not A) = 1 - Probability(A)
Dependent probability is the probability of an event which changes according to the outcome of some other event.