概率是高中数学的重要内容之一,且古典概型又是每年高考的必考内容,而古典概型的核心就是对相关事件的计算处理.笔者就自己教学中涉及的问题浅议如下:笔者在期末复习概率内容时给学生出示这样一道题:例1某人忘记了电话号码的最后一位数字,因而他随意地拨号,假设他拨过的号码不重复,求他第三次拨号正确的概率P. Probability is one of the important content of high school mathematics, and the classical profile is the compulsory content of the annual college entrance examination, and the core of the classical profile is the calculation of the relevant events.The author discusses the problems involved in his teaching as follows: At the end of the review of the probabilistic content at the end of the period, one such question is presented to the student: Example 1 A person forgets the last digit of a telephone number so he dials randomly, assuming that the number he dials is not repeated, asking him to dial the third time Probability