(N,k-1) = n(n-1)… *(n-k+2) / (k-1)!，其它類似

來源: 家有高中小娃於 2025-02-09 18:52:10 [舊帖] [給我悄悄話] 本文已被閱讀：次

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(N,k-1) = n*(n-1)*… *(n-k+2) / (k-1)!， 其它類似