Topics: Probability


An event is a subset of a sample space , where we can say whether an experiment is done or not.

Events are denoted by uppercase letters of the Latin alphabet:


Let and be two events. We say that:

  • is an impossible event if
  • is certain if
  • and occur if
  • or occur if
  • occurring implies that occurs if
  • and are disjoint or mutually exclusive events if