Question 1114945
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In  {{{(10+3+5)!/(10!*3!*5!)}}}  ways.


The numerator is the total number of permutations of 10+3+5 = 18 objects.


Each factorial in the denominator reflects the fact the inside the corresponding group of books their permutations produce indistinguishable arrangements.
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Now it is your part of work to compute this number.