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koafn
- 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