It is the probability of an event that will definitely happen.
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For any event A, Probability (not A) = 1 - Probability(A)
If an event has a probability of occurring p, then the probability of it not occurring is 1 - p. This is because the probability of something happening is always 1, i.e. p + (1 - p) = 1.
It is the probability of an event which 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.
No; probability is between 0 and 1 inclusive.