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Asking for help to teach high school mathematics is a compulsory course. The first chapter is about the trap and ingenious problems of set.
Example 1. There are 30 students in a class, of whom 15 likes basketball, 10 likes table tennis, and 8.

People don't like these two sports, so the number of people who like basketball and don't like table tennis is _? __

Answer: 12

Example 2. (Guangdong Convolution in 2009) Known Complete Works? , gather? and

The venn diagram of the relation is shown in figure 1, and the shaded part.

What elements does the series contain? (? )

A.？ Three bs? two

C.？ 1 d？ Infinite number

Answer: b

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