# What is Addition rule in Biology? PDF | Download eBooks

Learn *Addition rule* definition in biology with explanation to study “What is Addition rule”. Study addition rule explanation with biology terms to review biology course for online degree programs.

## Addition rule Definition

Addition rule states that the probability of an event that can occur in two or more independent, mutually exclusive ways is the sum of the individual probabilities.

Campbell Biology by J.B. Reece, L.A. Urry, M.L. Cain, S.A. Wasserman, P.V. Minorsky, R.B. Jackson

## Addition rule Explanation

When two events, A and B, are mutually exclusive, the probability that A or B will occur is the sum of the probability of each event. The probability that A or B will occur is the sum of the probability of each event, minus the probability of the overlap. P(A or B) = P(A) + P(B) - P(A and B).

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