题目网址: http://www.puzzleup.com/2014/
http://www.puzzleup.com/2014/puzzle/?256
答题时限: 11月６日７ＰＭ－比赛结束（约12月17日）
加分时限: 11月６日７ＰＭ－11月12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）　　
◆Chess Players
There are 24 players in a chess tournament. 8 teams participated with 2
players , and 8 teams participated with 1 player. For the 12 matches in the
first round, the pairings will be drawn randomly. What is the probability
that at least 4 matches will be played between players from the same team?
Enter your answer as a simplified fraction. Example:12/23
在一场西洋棋比赛中有 24 位参赛者。
有八个队伍有两人参赛，另外八个队伍有一人参赛。
第一回合的十二场比赛的对阵是随机决定的。
试问这当中存在至少四场比赛为来自同队伍的人对战的机率为何？
答案以最简分数输入，如 12/23。