There are two balls in an urn. Each ball can be either white or black. If a white ball is put into the urn and there after a ball is drawn at random from the urn, then the probability that it is white is

  • [AIEEE 2012]
  • A

    $\frac{1}{4}$

  • B

    $\frac{2}{3}$

  • C

    $\frac{1}{5}$

  • D

    $\frac{1}{3}$

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