An event that is guaranteed to happen, meaning it has a probability of 1, is referred to as a certain event. In probability theory, this means that there is no chance that the event will not occur. For example, the event of rolling a number between 1 and 6 on a standard six-sided die is a certain event, since you will always roll one of those numbers.
An event that is guranteed to happen, meaning it has a probability of 1.
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