Mathematically, an event is defined as an element of the σalgebra of the probability space.
For example, if we assemble a deck of 52 playing cards and two jokers, each individual card represents an elementary event in a 54element sample set, but subsets of the sample set (regardless of how many elementary events they contain) are called simply "events". Events from this sample set include "King" (a set 4 elementary events), "Spade" (13 elementary events), and "Face card" (12 elementary events).
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