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If events A and B are mutually exclusive, the joint probability of A and B is [...]
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Subject 3. Addition Rule for Probabilities: the Probability that at Least One of Two Events Will Occur
P(A or B) = P(A) + P(B) - P(AB) The logic behind this formula is that when P(A) and P(B) are added, the occasions on which A and B both occur are counted twice. To adjust for this, P(AB) is subtracted. <span>If events A and B are mutually exclusive, the joint probability of A and B is 0. Consequently, the probability that either A or B occurs is simply the sum of the unconditional probabilities of A and B: P (A or B) = P(A) + P(B). What is the probability t

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