400-600-1123
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答案：
E
问从60个�
条件一 1/2的学生是棕色头发
条件二 1/3的学生是男生
1/2的学生的头发是棕色的 并不意味着男生里面就有1/2的人的头发是棕色的，所以不能直接相乘进行计算 所以只能选E
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