在概率计算问题中,正确确定事件的类型是非常重要的,是等可能事件,互斥、相互独立还是独立重复试验?决定着计算概率的方法,许多错误都是由于不能正确定性而引起的.下面是学生作业和一些教辅资料中出现的几例错解,有一定的代表性,值得慎思. In the problem of probability calculation, it is very important to correctly determine the type of the event. Is it possible to wait for events that are mutually exclusive, independent of each other, or to repeat the test independently? The method of determining the probability is determined. Many errors are caused by the lack of positive certainty. The following are some examples of misunderstandings in student assignments and some supplementary materials. They are representative and worthy of deliberation.