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An event which has a probablility of 1 is one that will definitely happen. Probabilities range between 0 and 1 (0% and 100%) with a probability of zero meaning it is impossible and a probability of one meaning that it is definite. i.e. winning the lottery if you never play has a probability of zero and winning the lottery if you know the correct numbers in advance has a probability of one.

Q: What event has a probability of 1?

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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.

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

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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.

Probability of sure event is 1

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.

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).

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

Probability is on a scale of 1 to 0 and 1 is that .an event will certainly happen whereas 0 is that an event will not happen

an impossible event has a probability of 0, it will never occur a certain event has a probability of 1, it will always occur

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.