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Here 6 books, one is dictionary no. of ways to arrange 5 books (except dictionary) = 5P5 =5! = 120 no. of ways to arrange dictionary = 2 ( first or last place) total no. of ways to arrange 6 books = 2 * 120 = 240
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In how many ways 10 books can be arranged on a shelf so that a particular pair of book shall be a) always together ?
b) never together?