The probability that at least one of $A$ and $B$ occurs is $0.6$. If $A$ and $B$ occur simultaneously with probability $0.3$, then $P(A') + P(B') = $

  • A

    $0.9$

  • B

    $1.15$

  • C

    $1.1$

  • D

    $1.2$

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