#912 · Combinatorics · Counting
Choosing watches of four men
From a crew of 24 men, on how many nights can a watch of 4 men be drafted so that no two watches are identical?
H. S. Hall & S. R. Knight, Higher Algebra (1891) · Ch. XI. Permutations and Combinations, Examples XI.a, No. 11 (part 1)
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