Three letters,to each of which corresponds an envelope,are placed in the envelopes at random. The probability that all the letters are not placed in the right envelopes is

  • A
    $\frac{1}{6}$
  • B
    $\frac{5}{6}$
  • C
    $\frac{1}{3}$
  • D
    $\frac{2}{3}$

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