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答案：
C
第一次从3
车里挑中任意一辆车的概率是3/3 第二次从剩下2辆车里挑中任意一辆车的概率是2/3 第三次从挑中最后一辆车的概率是1/3 所以三次不重复的概率是3/3*2/3*1/3=2/9 
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