If the event will definitely occur, then its probability is 1.
Not asked, but answered for completeness sake - if the event will definitely not occur, then its probability is 0. All probabilities lie between 0 and 1, inclusive.
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An event that will definitely happen is an event with 100% probability.
The probability that an event will occur plus the probability that it will not occur equals 1.
These events are complementary. Let P(A) = probability event will occur. Then the probability it will not occur is: 1 - P(A).
The laws of probability predict what is likely to occur, not necessarily what will occur.
How likely it is for an event to occur.