以知识网络的交汇点设计的解答题,运用知识之间的交叉、渗透和组合,是基础性与综合性的最佳表现形式·在解决与自然数n有关的概率问题中,如果能从问题的情景中挖掘出概率之间的递推关系,往往能起到事半功倍的效果·下面通过几个例子加以说明·【例1】有A、B、C、D、E五人在球场 The solution to the intersection of knowledge networks and the use of cross-cutting, infiltration, and combination of knowledge are fundamental and synthetic best forms of expression. If problems can be solved by solving problems related to natural numbers n, Digging out the recursive relationship between the probabilities in a scenario often results in a multiplier effect. Here are some examples to illustrate: [Example 1] There are A, B, C, D, and E in the stadium.