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Math Help - Calculate the probability of the event

  1. #1
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    Calculate the probability of the event

    Calculate the probability of the event, when choosing a random permutation of {1, 2, ..., n}, n \ge 4.
    a) with 1 front 2
    b) with 2 front 1
    c) with 1 stand just before 2
    d) n front 1 and n-1 front 2
    e) n front 1 and n front 2
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  2. #2
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    Quote Originally Posted by seit View Post
    Calculate the probability of the event, when choosing a random permutation of {1, 2, ..., n}, n \ge 4.
    a) with 1 front 2
    b) with 2 front 1
    c) with 1 stand just before 2
    d) n front 1 and n-1 front 2
    e) n front 1 and n front 2
    Would you please either post some of your own work on these problems or explain what you do not understand about the question.
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