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# Double - only one outcome so by counting both heads for...

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Unformatted text preview: only one outcome; so, by counting both heads for that outcome, you are double-counting because this is the joint-occurrence outcome that is not mutually exclusive. To use the addition rule in a non-mutually-exclusive situation, you must subtract any events that double-count. In this case: The notation, therefore, for at least one favorable occurrence in two events is P ( A ∪ B ) = P ( A ) + P ( B ) – P ( A ∩ B ) which is read: The probability of at least one of the events A or B equals the probability of A plus the probability of B minus the probability of their joint occurrence. (Note that if they are mutually exclusive, then P ( A ∩ B )—the joint occurrence—equals 0, and you simply add the two probabilities.)...
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Double - only one outcome so by counting both heads for...

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