在求解概率问题中,经常涉及诸如n个球放入N个盒子中的“放进”问题和产品抽取中的“取出”问题,同学们常对“元素”是否相同(即元素的可分辨和不可分辨)要不要讨论纠缠不清,以致造成思维混乱,致使解题失误.下面笔者结合实例谈谈这两类问题的解法区别,以帮助同学们澄清认识,提高 In solving the probabilistic problem, the “put in” question such as n balls put into N boxes and the “take out” question in product extraction are often involved. The students often have the same “elements” (that is, the elements are distinguishable and Indiscernible) Whether or not to discuss entanglement, resulting in confusion of thinking, resulting in misunderstandings. The following author combines examples to discuss the difference between the two types of problems to help students clarify and improve