Flashcard 3 - 11th Grade Mathematics: Statistics and Probability Flashcard Set for the SBAC
Back
If A and B are complementary events, \(P(A) + P(B) = 1\).
Explanation:
For any event A, the complement is that event not occurring, not A. By the definition of probability, the sum of the probabilities of an event occurring and the event not occurring must equal 1. Either A or not A must happen.
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