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Ben has 30 pencils in a box. Each of the pencils is one of 5 different colors, and there are 6 pencils of each color. If Ben selects pencils one at a time from the box without being able to see the pencils, what is the minimum number of pencils that he must select in order to ensure that he selects at least 2 pencils of each color?
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当前版本由 351152rkspp 更新于2021-02-09 17:01:28 感谢由 351152rkspp 对此题目的解答所做出的贡献。
翻译：
Ben 的盒子中有 30 支铅笔，其共有 5 种不同的颜色，且每种颜色均有 6 支. 若 Ben 随机从中取出铅笔，则最少取出多少支能保证每种颜色都有 2 支铅笔?
解析：
抽屉原理，即考虑最差的情况：先取完所有其他四色铅笔，再取最后一种颜色两支.
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