一般地,对于n个随机事件A1,A2,…,An中,至少有一个发生的事件,叫做这n个事件的和事件.记作事件A1+A2+…+An.和事件的概率可用其对立事件的概率表示,即P(A1+A2+…+An)=1-P(A1·A2·…·An),称为概率的和与积的互补公式,求和事件的概率时常常用到它.解决概率问题时,求和事件的概 In general, for n random events A1, A2, ..., An, there is at least one event that occurs, called the sum event of these n events. The probability that the event A1+A2+...+An. The probability of the event is expressed as P(A1+A2+... +An)=1-P(A1·A2···An), which is called the complementary formula of the sum and product of the probabilities. It is often used when summing the probabilities of events. Solving Probability Problems, Summary of Summation Events