#897 · Combinatorics · Counting

Selections from multiple copies

There are $n$ distinct titles of books, each with $p$ identical copies. How many non‑empty selections of books can be made?

~5 minAnswer checked instantlycountingmultisets

H. S. Hall & S. R. Knight, Higher Algebra (1891) · Ch. XI. Permutations and Combinations, Examples XI.b, No. 26

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