13.1 Mutually exclusive events

AQA Edexcel OCR A OCR B (MEI)
Mutually exclusive events cannot happen at the same time.

For example, rolling 1 or 2 on a dice is mutually exclusive.

For mutually exclusive events:

\(P(A~\text{or}~B) = P(A∪B) = P(A) + P(B) \)
Important
Mutually exclusive events

\(P(A∪B) = P(A) + P(B) \)
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