To find the probability that an event will not occur, you work out the probability that it will occur, and then take this number away from 1. For example, the probability of not rolling two 6s in a row can be worked out the following way:
The probability of rolling two 6s in a row is 1/6 x 1/6 = 1/36
Thus the probability of not rolling two 6s in a row is 1 - 1/36
=35/36.
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The probability that an event will occur plus the probability that it will not occur equals 1.
These events are complementary. Let P(A) = probability event will occur. Then the probability it will not occur is: 1 - P(A).
How likely it is for an event to occur.
Probability is a measure of the expectation that an event will occur or a statement is true. Probabilities are given a value between 0 (will not occur) and 1 (will occur).[1] The higher the probability of an event, the more certain we are that the event will occur.
That is the probability of that event.