The probability of an impossible event is 0 (zero).
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It is the probability of that event.
If the event is truly impossible, it has a zero probability of occurring. The definition of impossible is "not able to occur, exist, or be done," so that means there's no chance of it happening.
A probability of 0 means the event is impossible.
zero
If the probability of a event is zero, then the event cannot occur. Therefore, if the probability of an even number is zero, then the probability of an odd number is one.