2. 外语
  3. There are 35 applicants applying for the position. 20 of them have experience, 13 of them are older than 25 years old, and 5 hav

There are 35 applicants applying for the position. 20 of them have experience, 13 of them are older than 25 years old, and 5 hav

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问题 There are 35 applicants applying for the position. 20 of them have experience, 13 of them are older than 25 years old, and 5 have no experience and are younger than 25 years old. How many of the applicants have experience and older than 25 years old?
选项 A、7
B、12
C、5
D、4
E、3
答案E
解析 假设集合A为有工作经验的人，那么A=20，假设集合B为大于25岁的人，那么B=13，小于25岁并且没有工作经验的人用集合N=5表示，代入公式得到：35=20+13-O+5，因此O=3，选择E。
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