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1. If there are 4 Geometry books. 2 Trigonometry books and 1 Statistics book how many ways can he arrange the top layer of the shell? 2. If there are 5 Biology books Chemistry books, and 2 Earth Science books, how many ways can he arrange the middle layer? 3. If there are 8 Literature books and 2 books in Linguistics, how many ways can be arrange the bottom layer?.