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Mr. Confused wrote to his five friends

  • 2014-03-05
  • 199.81KB
  • Points it Requires : 2

Mr. Confused wrote five letters to his five friends. But when his friends received the letters, they all told him, \"You sent the wrong letter.\" So please calculate: What is the probability of this happening? (Assuming that Mr. Confused put the letters into the envelopes randomly), can you list all the situations?

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