Probability of zero means that there is no chance that the event will happen. First example that comes to mind: What is the probability of rolling a 7 on one roll of a standard six-sided die. Well you can't, so the probability of this happening is zero.
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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.
Zero.
A probability of one means that the outcome will definitely occur.Not asked, but answered for completeness sake - a probability of zero means that the outcome will definitely not occur. Probability always lies between zero and one, inclusive.
The probability of not one is zero.
The probability, in my case, is zero.