PRC-2 · Chapter 11 · Question 48 of 60
The 'Complementary Rule' in probability theory states that the probability of an event NOT occurring [P(A')] is equal to:
Test yourself: pick an answer
Reveal answer & explanation
Correct answer: B) 1 - P(A)
Explanation
Since the sum of all possible outcomes must equal 1, the probability of an event not happening is simply 1 minus the probability that it does happen.
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