Question

(理)一个电路上装有甲、乙两根熔丝,甲熔断的概率为0.85,乙熔断的概率为0.74,甲、乙两根熔丝熔断相互独立,则至少有一根熔断的概率为

A.0.15×0.26=0.039                       B.1-0.15×0.26=0.961

C.0.85×0.74=0.629                       D.1-0.85×0.74=0.371

Answer 1

答案：(理)B  都不熔断的概率为0.15×0.26,对立事件为至少有一根熔断,概率为1-0.15×0.26=0.961.