同样的电子元件,在电路中接法不同,电路正常工作的概率也不同.解决这类问题的方法,有:(1)直接法:把所求的事件分成若干个互斥事件之和,根据互斥事件的概率公式求解;(2)间接法:当所涉及的事件较多,而其对立事件所涉及的事件较少时,可根据对立事件的概率公式求解. The same electronic components are connected in different ways in the circuit, and the probability that the circuit works normally is also different. The methods to solve such problems are: (1) Direct method: divide the requested event into the sum of several mutually exclusive events, according to Solve the probabilistic formula of mutual exclusion events; (2) Indirect method: When there are more events involved and fewer events are involved in the opposite event, it can be solved according to the probability formula of the opposite event.