March 29, 2017

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if a set of six books is placed randomly on a shelf, what is the probability that they will be arranged in either correct or reverse order?

  • math - ,

    number of ways to arrange 6 books = 6! = 720
    One of those will be correct, and one will be in reverse order.
    so prob of your event = 2/720 = 1/360

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