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文件名称:一个排列的计数问题 (1985年)
文件大小:65KB
文件格式:PDF
更新时间:2021-05-24 19:45:14
自然科学 论文
In this paper, a pre-derangement problem similar to that of derangement is considered; a counting formula and a recurrence formular of this problem are given.