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抓阄儿,就是为了赌胜负或决定的事情而各自抓取做好记号的纸团等。质疑:这种做法公平吗?剖析:为方便计算,不妨设有n张纸团,有,z个人排队去抓纸团,假定只有1张纸团上有字,其余均无字,抓到有字的为赢(实际操作中,当人抓到的为无字的纸团后即刻将它扔掉,所以这种抽取显然是“不放回抽取”类型),则第1个人抓到有字的概率为1/n,第2人抓到有字的概率为1/(n-1),…,第i个人抓到有字的
Grasping children, is to bet on the outcome of the decision or something and pick up a good note of the paper ball. Question: Is this fair? Analysis: To facilitate the calculation, there may be n pieces of paper, there are, z individuals queuing to pick the paper group, assuming only one paper ball on the word, the rest are not words, The word for the win (in practice, when the person grasps the wordless paper lump immediately after throwing it away, so this extract is obviously “do not put back to extract ” type), then the first person caught The probability of having a word is 1 / n, the probability of the second person catching a word is 1 / (n-1), ..., the i-th person catching a word