If two events $A$ and $B$ are such that $P(A^c) = 0.3$,$P(B) = 0.4$,and $P(A \cap B^c) = 0.5$,then $P[B / (A \cup B^c)]$ is equal to

  • A
    $1/2$
  • B
    $1/3$
  • C
    $1/4$
  • D
    None of these

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