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所谓相关元素定位法,是当遇到要同时考虑二个相互制约的元素时可将其中的一个首先固定,在此前提下,考虑另一元素的各种可能状态,从而建立起相应求解策略,一般此必是最佳的解题策略.例1 k个朋友随机地围圆绕桌而坐,求甲、乙两人坐在一起(座位相邻)的概率.解析设甲已先坐好,考虑乙怎么坐法,甲有k种坐法,对于这每一种坐法,乙有k-1种坐法,由乘法原理知,甲已坐好,乙的坐法总数即基本事件的总数n=(k-1),而A包含的基本
The so-called relevant element positioning method is to fix one of the two mutually constrained elements at the same time in the first instance, and on the premise of considering various possible states of the other element to establish a corresponding solution strategy, This is generally the best solution to the problem. Example 1 k friends around the table randomly around the round, and find a, B two people sitting together (adjacent to the seat) probability analysis of armor has been sitting well, Consider how to sit B, A k sitting, for each sitting, B has k-1 sit, known by the principle of multiplication, A has been sitting, B sitting the total number of basic events that the total number of n = (k-1), and A contains the basic