资 源 简 介
糊涂先生给他的五个朋友写信，他写了五封信，但是当他的朋友收到信后，都告诉他：“你的信寄错了”。那么请你计算一下：出现这种情况的概率有多少？（假设糊涂先生是随机地往信封里装信的），你能不能把所有的情况都列出来呢？-confused to his five friends in a letter he wrote five letters, but when his friend received the letter, had told him : "You sent a letter wrong." Then you do some calculations : this happens the probability is the number? (Assuming confused is randomly installed to envelope the letter), you can put all the cases listed?
