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[全澳] 小学题求解 [复制链接]

qj94

银靴族

发表于 2017-12-22 17:26 |显示全部楼层

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A teacher provides four special lessons, one each in Maths, Music,
English and Science, for some of the children in her class. For the
students in these special lessons:
• there are exactly 3 children in each lesson.
• each pair of students attends at least one special lesson together.
What is the largest number of students who can attend these special
lessons?

谢谢。主要是解题思路