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2.1 Events and the sample space

Probability is a measure of the chance that an outcome or an event may occur, in the same way that length is a measure of the magnitude of an object. In particular, probability is defined on the framework of events that consists of:

  • the outcomes of an experiment (the elements of a set) ;

  • the sample space which is the list of all these outcomes (the universal set) ;

  • the events, collections of outcomes (subsets of the sample space).