$P(A \cup B) = P(A \cap B)$ if and only if the relation between $P(A)$ and $P(B)$ is

  • [IIT 1985]
  • A

    $P(A) = P(\bar A)$

  • B

    $P\,(A \cap B) = P(A' \cap B')$

  • C

    $P\,(A) = P\,(B)$

  • D

    None of these

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