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Q: What is the definition of an event that has a probability of 1?

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If an event is certain, the probability is 1.

No. The probability of any event must, by definition, be in the interval [0, 1].

A probability of 0 means the event is impossible.

The complement (not compliment) of the probability of event A is 1 minus the probability of A: that is, it is the probability of A not happening or "not-A" happening.The complement (not compliment) of the probability of event A is 1 minus the probability of A: that is, it is the probability of A not happening or "not-A" happening.The complement (not compliment) of the probability of event A is 1 minus the probability of A: that is, it is the probability of A not happening or "not-A" happening.The complement (not compliment) of the probability of event A is 1 minus the probability of A: that is, it is the probability of A not happening or "not-A" happening.

A probability of 1 refers to an event that is certain to happen.A probability of 1 refers to an event that is certain to happen.A probability of 1 refers to an event that is certain to happen.A probability of 1 refers to an event that is certain to happen.

The probability of the complement of an event, i.e. of the event not happening, is 1 minus the probability of the event.

The probability of an event not occurring is 1 minus the probability of it occurring.

It is the probability of an event that will definitely happen.

For any event A, Probability (not A) = 1 - Probability(A)

The probability that an event will occur plus the probability that it will not occur equals 1.

No. The probability of an event ranges from 0 (the event will not happen) to 1 (the event will happen).

Not sure about the "best" definition. It is the set of all possible outcomes for the event.

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