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Math Help - probability

  1. #1
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    probability

    A postman has to deliver 8 letters in 8 different addresses, he was confused and just randomly handing the matches.
    If each address received a letter, which is the probability that at least one of them has received the letter correct?
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    Quote Originally Posted by Apprentice123 View Post
    A postman has to deliver 8 letters in 8 different addresses, he was confused and just randomly handing the matches.
    If each address received a letter, which is the probability that at least one of them has received the letter correct?
    1 - Pr(none correct). And the probability of none correct is a well known problem ...... Read http://en.wikipedia.org/wiki/Derangement
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    thank you men
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