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题目内容
In a certain survey, 40 percent of the people surveyed own at least one dog, 30 percent own at least one cat, and 40 percent own neither a dog nor a cat. Of those surveyed that own at least one dog, what percent also own at least one cat?
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6.1.2 交集、并集、补集、全集关系
6.1.2 交集、并集、补集、全集关系
以上解析由 考满分老师提供。