有红、黄、绿、白四种颜色的小球各许多个，每个人可以从中任意选择两个，那么需要__ 发布时间：2017-06-02 19:26 │ 来源：www.tikuol.com 题型：填空题 问题： 有红、黄、绿、白四种颜色的小球各许多个，每个人可以从中任意选择两个，那么需要______个人才能保证至少有两人选的小球颜色相同．
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