題目網址: https://www.puzzleup.com/2022/
https://www.puzzleup.com/2022/puzzle/?9
答題時限: 12月15日7PM-比賽結束(約12月29日)
加分時限: 12月15日7PM-12月20日6:59PM
答對可得基本分100分。答案可上傳5次,每改1次答案從基本分扣20分。
比賽期間內可隨時上傳答案,加分時限內答對第n天加(6-n)分
另依題目的難易有額外加分(如有80%的人這題答錯,答對者加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位學生將組成若干個美術小組與體育小組。
-每個小組包含3位學生。
-每個學生都要加入至少一個美術小組以及至少一個體育小組。
-對任意兩位學生而言,他們共通的美術小組數量跟共通的體育小組數量要相等。
-同樣的三位學生,不得出現在一樣的美術小組與體育小組。
問滿足上述條件,所組成的美術小組與體育小組的數量總和?