Question 1179121
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Hi
17books:  6M  4E  7F
ways to arrange all books such that the books of the same subject are kept 'together.'?
same subject as an unit ... 3!
ways to arrange each unit: M(6!) E (4!) F(7!)
ways... (3!)[(6!)(4!)(7!)]

Wish You the Best in your Studies.
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