The ________ of an event A is the event that A does not occur.

  • Complement
  • Mirror
  • Opposite
  • Substitute
In probability theory, the "complement" of an event A is the event that A does not occur, often denoted as A'. If the probability of event A happening is P(A), then the probability of it not happening, or its complement, is P(A') = 1 - P(A).
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