在第11、12、15、17路公共汽車(chē)都要?康囊粋(gè)車(chē)站,有一位乘客等候著11路或15路汽車(chē),假定各路汽車(chē)首先到達(dá)車(chē)站的可能性相等,那么首先到站且正好是這位乘客所要乘坐的車(chē)的概率是
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