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一道gmat数学题A company that ships boxes to a total of 12 distrib

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一道gmat数学题
A company that ships boxes to a total of 12 distribution centers uses color coding to identify each other. If either a single color or a pair of two different colors is chosen to represent by that choice of one or two colors, what is the minimum number of colors needed for the coding? (Assume that the order of the colors in a pair does not matter)
一道gmat数学题A company that ships boxes to a total of 12 distrib
最少要用五种颜色
再问: 这题怎么翻译呢?
再答: 就是12个东西要标记 用1个颜色或两个不同颜色标记 问最少要用几种颜色能标完