Bayes' theorem
noun
\ ˈbāz-
\
\
variants:
or less commonly Bayes theorem
or less commonly Bayes's theorem
Definition of Bayes' theorem
: a theorem about conditional probabilities: the probability that an event A occurs given that another event B has already occurred is equal to the probability that the event B occurs given that A has already occurred multiplied by the probability of occurrence of event A and divided by the probability of occurrence of event B
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