Suppose you want to arrange your English, Hindi, Mathematics, History, Geography and Science books on a shelf. In how many ways can you do it ?
We have to arrange 6 books.
The number of permutations of n objects is n!=n.(n–1).(n–2)...2.1
Here n=6 and therefore, number of permutations is 22.214.171.124.2.1= 720
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