If $A$ and $B$ are two events, then the probability of the event that at most one of $A, B$ occurs, is

  • [IIT 2002]
  • A

    $P(A' \cap B) + P(A \cap B') + P(A' \cap B')$

  • B

    $1 - P(A \cap B)$

  • C

    $P(A') + P(B') + P(A \cup B) - 1$

  • D

    All of the these

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