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定理:n个不同的元素排成一列,重新排列时,其中有m(m≤n)个元素不许排在原来的位置,则其不同的排法有:请下载后查看，本文暂不支持在线获取查看简介。
Theorem: n different elements are arranged in a row. When they are rearranged, among them, there are m (m≤n) elements that are not allowed to be in the original position. The different rows are: Please download and view. This article does not support online at this time. Get a brief introduction.