某种电路开关闭合后,会出现红灯或绿灯闪动,已知开关第一次闭合_优题课试题网

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更新 2022-09-03
科目数学
题型选择题
难度中等
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某种电路开关闭合后,会出现红灯或绿灯闪动,已知开关第一次闭合后,出现红灯和出现绿灯的概率都是,从开关第二次闭合起,若前次出现红灯,则下一次出现红灯的概率是,出现绿灯的概率是;若前次出现绿灯,则下一次出现红灯的概率是,出现绿灯的概率是,则三次发光中,出现一次红灯、两次绿灯的概率是（）

A．

B．

C．

D．

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