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The Theoretical probability of the occurence of an event E written as P(E) is
Experiment: An activity which ends in some well defined outcomes is called an experiment.
Trial: Performing an experiment once is called a trial.
Event: The possible outcomes of a trial is called an event.
Sure event: An event whose occurence is certain is called a sure event.
The sum of the probability of all the elementary events of an experiment is 1.
The probability of a sure event is 1 and probability of an impossible event is 0.
If E is an event, in general, it is true that P (E) + P E = 1. [P(E) = P(notE)]
From the definition of the probability, the numerator is always less than or equal to the denominator therefore 0 ≤ P(E) ≤ 1.