SOLUTION: Ricardo has 6 books written by five different authors.in how many ways can he arrange them on a shelf so that the two books by the same author are next to each other?

Question 449998: Ricardo has 6 books written by five different authors.in how many ways can he arrange them on a shelf so that the two books by the same author are next to each other?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Ricardo has 6 books written by five different authors.in how many ways can he arrange them on a shelf so that the two books by the same author are next to each other?
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ways to arrange the 2 books = 2
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Now treat those 2 books as one "book".
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ways to arrange the 4 books = 4! = 24
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Total # of ways to arrange the 5 books: 2*24 = 48
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Cheers,
Stan H.
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