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题目网址: http://www.puzzleup.com/2014/
http://www.puzzleup.com/2014/puzzle/?261
答题时限: 12月11日７ＰＭ－比赛结束
加分时限: 12月11日７ＰＭ－12月17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）
◆Balls
There are six red balls and four black balls in a box. The balls are randomly
drawn one by one and the colors are tallied. The process is continued until
all the balls have been drawn. What is the probability that the number of red
balls is always bigger then the number of black balls throughout the whole
tallying process?
Enter your answer as a simplified fraction. Example:12/23
箱子里有六个红球跟四个黑球。
这些球随机地逐一抽出并统计颜色，直到所有球都被抽出来为止。
试问在统计过程中红球数目一直都大于黑球数目的机率是多少？
答案以最简分数输入，如 12/23。