Circular permutation

Japanese: 円順列 - えんじゅんれつ
Circular permutation
n-1)…(n-r+1)/r is an array of n items taken from a set of items and arranged in a circular pattern.

Source: The Selected Edition of the Japanese Language Dictionary About the Selected Edition of the Japanese Language Dictionary Information

Japanese:
〘名〙 いくつかのものから一定個数のものを取り出して、円形に並べてえられる配列。n個のものからr個のものを取り出す場合のその総数はn(n-1)…(n-r+1)/rである。

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