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等可能事件的概率问题是最基本的概率类型 ,它与排列组合知识有着密切的联系 ,也是学生比较容易掌握的内容 .但是在教学过程中却发现许多同学并没有真正理解等可能事件的概率定义 ,只是盲目套用公式P(A) =mn,不能准确把握n与m的意义 ,从而出现错误 .例 1 某人有 5把钥匙 ,其中
The probability problem of such possible events is the most basic type of probability. It is closely related to the arrangement and combination of knowledge, and it is also easier for students to grasp. However, in the teaching process, it was found that many students did not really understand the probabilistic definition of possible events. , just blindly applying the formula P(A) = mn cannot accurately grasp the meaning of n and m, resulting in errors. Example 1 Someone has 5 keys, among them