2. How many ways can 2 Physics books, 4 Mathematics books and 3 Chemistry books be arranged on a shelf if all books of the same subject may be arranged in any order but must be together?
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So, we have 2 Physics books, 2 Mathematics books, and 1 "unit" of Chemistry books to arrange. There are 5! (5 factorial) ways to arrange these 5 items on the shelf. Show more…
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