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The probability of an impossible event is 0 (zero).
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.
It is an impossible event - which has probability zero.
Probability is measured on a scale of 0 to 1 meaning at 0 it will not happend but at 1 it will happen So a negative event is impossible