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The number of ways that 15 books can be arranged on a shelf is the same as the number of permutations of 15 things taken 15 at a time. This is 15 factorial, or 15!, and is 1,307,674,368,000.

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โˆ™ 2011-03-08 22:11:04
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Q: How many different ways can 15 books be arranged vertically side by side on a shelf?
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