SOLUTION: A library has 3 books from each of 3 different authors. How many ways can the library arange the books on the shelf if books by the same author must be placed together?

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Question 1145320: A library has 3 books from each of 3 different authors.
How many ways can the library arange the books on the shelf if books by the same author must be placed together?
Answer by ikleyn(52781) About Me  (Show Source):
You can put this solution on YOUR website!
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The answer and the solution depends on the fact if 3 books of each author are different (distinguishable) or identical.

Unfortunately, the condition says nothing about it . . .