The addition rule for probabilities is P(A or B) = P(A) + P(B) − P(AB).
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P(A | B) = P(AB)/P(B), P(B) ≠ 0.
The multiplication rule for probabilities is P(AB) = P(A | B)P(B).
The probability that A or B occurs, or both occur, is denoted by P(A or B).
<span>The addition rule for probabilities is P(A or B) = P(A) + P(B) − P(AB).
When events are independent, the occurrence of one event does not affect the probability of occurrence of the other event. Otherwise, the events are dependent.
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