Lemma
EasyCounting
#868 · Combinatorics · Counting

Shelving volumes of works

There are two works each consisting of three volumes and two works each consisting of two volumes, making a total of ten books. In how many ways can the books be placed on a shelf so that the volumes belonging to the same work remain together?

~4 minAnswer checked instantlyblocksinternal order

H. S. Hall & S. R. Knight, Higher Algebra (1891) · Ch. XI. Permutations and Combinations, Examples XI.a, No. 28

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