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In probability theory, events E < sub > 1 </ sub >, E < sub > 2 </ sub >, ..., E < sub > n </ sub > are said to be mutually exclusive if the occurrence of any one of them automatically implies the non-occurrence of the remaining n − 1 events.
Therefore, two mutually exclusive events cannot both occur.
Formally said, the intersection of each two of them is empty ( the null event ): A and B

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