How many ways can you arrange 6 books on a shelf?

The first book can be chosen in 6 ways, the second in 5 ways, the third in 4 ways, the fourth in 3 ways, the fifth in 2 ways, and of course the last one in 1 way.
according to the multiplication rule, 720 ways are obtained.
6 * 5 * 4 * 3 * 2 * 1 = 720.



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