在古典概率求解问题中,有一类重要而常见的模型:盒中投球与袋中摸球的概率计算问题.由于“球”是否可分辨,盒中盛球数量是否受限以及“球”是否全部放入等条件的制约,使得这类概率计算显得扑朔迷离,真假难辨!从而使很多同学感到这部分内容在学习时心存困惑.本文试图总结几种常 In the classical problem solving problem, there is an important and common model: the probability of calculating the ball in the box and touching the ball in the bag. Since the “ball” is distinguishable, whether the number of balls in the box is limited and whether the “ball” is all The constraints imposed by such conditions make this type of probability calculation confusing and difficult to distinguish! Therefore, many students feel that this part of the content is puzzled during learning. This article attempts to summarize several kinds of