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# Math question?

In how many ways one can arrange 2 identical history books, 3 identical physics books, and 5 identical math books?

Update:

Combinatorics question

### 3 Answers

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- PuzzlingLv 72 months agoFavourite answer
If they were 10 distinguishable books, then there would be 10! permutations. But we need to divide by 2!, 3! and 5! to account for the arrangements of each book subject that would be indistinguishable.

10! / (2! 3! 5!) = 2520 ways

- Bill-MLv 72 months ago
That is 10 books total. 10! (10 Factorial). = 3628800

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- SumDudeLv 72 months ago
1 - unless you have OCD and keep moving them around.

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I'm not op, but can i ask why that is? i just saw the question and was interested.