Probability
See also: numbers, Permutations and Combinations
Complement of an event
The complement of an event A is the set of all outcomes that is not A. The complement of event A is expressed as A (A bar).
The probability of an event and its complement always add up to 1 (An event is either occur or it doesn't occur).
| P(A) + P(A) = 1 |
| P(A) = 1 - P(A) |
Examples:
When tossing a fair six-sided die, the probability of not getting a 5 would be
P(5) = 1 - P(5)
P(5) = 1 - 1/6
P(5) = 5/6
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See also: numbers, Permutations and Combinations
