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
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这是amc 题目吧。还要其他帮助,可以加我
![_20171222_201721.JPG _20171222_201721.JPG](/style/images/grey.gif)
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ABC
ADE
BDE
CDE
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