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Martin has four books. In how many ways can he arrange them on his bookshelf?

Sagot :

book 1, book 2, book 3, book 4,
book 4, book 3, book 2, book 1
book 2, book 3, book 1, book 4

1, 3, 2, 4
3, 2, 1, 4
3, 2, 4, 1 
 
6 ways :) Hope this helps