题目

A judge was working in his room one day when a neighbour ran in and said, “If one man's cow kills another's, is the owner of the first cow responsible(有负责的)?”“It depends(不一定),” answered the judge.“Well,” said the man, “your cow has killed mine.”“Oh,” answered the judge. “Everyone knows that a cow cannot think like a man, so a cow is not responsible, and that means that its owner is not responsible either.” “I am sorry, Judge,” said the man. “I made a mistake. I meant that my cow killed yours. ”The judge thought for a few seconds and then said, “W同时掷二枚普通的骰子，数字和为1的概率为    ，数字和为7的概率为    ，数字和为2的概率为    ．