Statistics Dictionary

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Subtraction Rule

The rule of subtraction follows directly from two important properties of probability:

  • The probability of a sample point ranges from 0 to 1.
  • The sum of probabilities of all the sample points in a sample space equals 1.
Rule of Subtraction The probability that event A will occur is equal to 1 minus the probability that event A will not occur.
P(A) = 1 - P(A')

See also:   Rules of Probability | Probability Calculator