If $P\,({A_1} \cup {A_2}) = 1 - P(A_1^c)\,P(A_2^c)$ where $c$ stands for complement, then the events ${A_1}$ and ${A_2}$ are

  • A

    Mutually exclusive

  • B

    Independent

  • C

    Equally likely

  • D

    None of these

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