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1. Between two book-ends in your study are displayed your five favourite puzzle books. If you decide to arrange the five books in every possible combination and moved just one book every minute, how long would it take you ?





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  • By: guest on 02 Jun 2017 02.07 am
    Clearly, number of ways of arranging 5 books = 5 ! = 5 x 4 x 3 x 2 x 1 = 120.So, total time taken = 120 minutes = 2 hours.
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