Something just happened. As something would have to happen to make nothing happen, the probability of something else happening is approximately 100%.
If you have a more specific definition of something, probability can be calculated by [# of events] divided by [# of possible outcomes].
For example:
> The chances of rolling a 1 or a 2 on a 6-sided die
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The total probability of something happening plus the probability of that same thing not happening is 1, or 100 % → probability of not happening = 1 - 0.25 = 0.75 or 100 % - 25 % = 75 %
The probability of something NOT happening is the complement of the probability of something happening. Since the probability that you DO have 3 heads is 1/8 (that is, 1/2 cubed), the complement is 1 - 1/8 = 7/8.
0 means there is no chance of something happening. You cannot have less than no chance of something happening. So a probability cannot be less than 0.
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.
No. A probability of 1 means something will definitely happen. There cannot be a greater certainty than that, so probability cannot be greater than 1. 0 means there is no chance of something happening. You cannot have less than no chance of something happening. So a probability cannot be less than 0.