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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
- calculated by 2[either rolling a 1 or rolling a 2] divided by 6[either rolling a 1 and rolling a 2 and rolling a 3 and rolling a 4 and rolling a 5 and rolling a 6]
- 2/6 = 1/3 = One in Three ~ 33.333%
- calculated by ∞[infinite number of somethings] divided by ∞[infinite possible occurences of something]
- ∞/∞ = 1 = 100%
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If the probability that an event will happen is .25 or 25 percent what is the probability that it will not happen?
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 %
What is the probability of not tossing three heads with three fair coins?
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.
Why cannot a probability not be less than 0?
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.
What does it mean to find the compliment of the probability of an 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.
Can a probability be more than 1 or less than 0?
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.
