构造恰当的样本空间是古典概率解题的第一步,选择样本空间的计量方法是解决问题的关键.对于同一个随机试验,样本空间可以相当简单,也可以相当复杂.下面通过实例,谈谈在保证等可能性的前提下,通过改变样本容量计量方法或缩减样本空间使得概率计算化繁为简的思维策略.1改变样本空 Constructing an appropriate sample space is the first step in solving the classical probability problem. Selecting the sample space measurement method is the key to solving the problem. For the same random experiment, the sample space can be quite simple or quite complex. Let’s talk about examples. On the premise of guaranteeing equal probability, change the sample size by changing the sample size measurement method or reducing the sample space so that the probability calculation can be simplified.