Biology / Bio 1021 · Atom · ~20 seconds
The Rule of Addition
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The rule of addition, also called the sum rule, gives the probability of either of two mutually exclusive events by summing their probabilities.
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A coin toss's chance of landing heads or tails is one half plus one half, or a certainty.
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The rule of addition applies only to mutually exclusive outcomes — it is the wrong rule for combined, independent events.