ce could not occur. To give such an event a name, we shallrefer to it as the null event and denote it by Ø. (That is, Ø refers to the eventconsisting of no outcomes.) If EF = Ø, then E and F are said to be mutuallyexclusive.We also define unions and intersections of more than two events in a simi-lar manner. If E1 , E2 , . . . are events, then the union o
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