题目网址: https://www.puzzleup.com/2022/
https://www.puzzleup.com/2022/puzzle/?9
答题时限: 12月15日7PM-比赛结束(约12月29日)
加分时限: 12月15日7PM-12月20日6:59PM
答对可得基本分100分。答案可上传5次,每改1次答案从基本分扣20分。
比赛期间内可随时上传答案,加分时限内答对第n天加(6-n)分
另依题目的难易有额外加分(如有80%的人这题答错,答对者加80分)
◆ARTS AND SPORTS GROUPS
Arts and sports groups will be formed in a class of 12 students.
-Each group consists of 3 students.
-Each student will take part in at least one art and at least one sports
group.
-For any pair of students, the number of arts groups and sports groups
that both students are members are the same.
-No three students can be in the same arts group and sports group.
What is the total number of arts and sports groups created to meet these
conditions?
班上12位学生将组成若干个美术小组与体育小组。
-每个小组包含3位学生。
-每个学生都要加入至少一个美术小组以及至少一个体育小组。
-对任意两位学生而言,他们共通的美术小组数量跟共通的体育小组数量要相等。
-同样的三位学生,不得出现在一样的美术小组与体育小组。
问满足上述条件,所组成的美术小组与体育小组的数量总和?