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If all nine items are included in every arrangement, like 9 books

on a shelf with no spaces, then there are "9 factorial" =

9 x 8 x 7 x 6 x 5 x 4 x 3 x 2 = 362,880 different ways to line them up.

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11y ago

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Q: How many different ways can you arrange 9 items?
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