An event will happen or not so its probabilty is between 0 (never happen) and 1 (will surely happen).
The probability is a measure of its chance to happen.
A negative probability would have no sense.
You can think about probabilty this way: imagine a 1-litre bottle, it can be empty (0 litre) or full (1 litre) and any value between 0 and 1 but the value can't be negative.
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No; because probability can never be less than zero.
The probability of an impossible event is 0.The probability of an impossible event is 0.The probability of an impossible event is 0.The probability of an impossible event is 0.
The probability of the complement of an event, i.e. of the event not happening, is 1 minus the probability of the event.
The complement (not compliment) of the probability of event A is 1 minus the probability of A: that is, it is the probability of A not happening or "not-A" happening.The complement (not compliment) of the probability of event A is 1 minus the probability of A: that is, it is the probability of A not happening or "not-A" happening.The complement (not compliment) of the probability of event A is 1 minus the probability of A: that is, it is the probability of A not happening or "not-A" happening.The complement (not compliment) of the probability of event A is 1 minus the probability of A: that is, it is the probability of A not happening or "not-A" happening.
The probability that an event will occur plus the probability that it will not occur equals 1.