Yes. It is a certain event. If a coin is tossed, a 'head or tail would roll' is a certain event and has probability 1.
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The probability that an event will occur plus the probability that it will not occur equals 1.
If the probability of an event occurring is p, then 1-p represents the probability of the same event not occurring. The value of p must lie between 0 and 1.
These events are complementary. Let P(A) = probability event will occur. Then the probability it will not occur is: 1 - P(A).
Probability is a measure of the expectation that an event will occur or a statement is true. Probabilities are given a value between 0 (will not occur) and 1 (will occur).[1] The higher the probability of an event, the more certain we are that the event will occur.
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.