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在学习排列组合过程中,甚至在学完排列组合基础知识后,碰到有关的应用题在列式计算中仍然出现较多的错误,其集中表现是重算或漏算。究其原因,常常是对该题事件或有无顺序未判准、或解剖为几个步骤界限未划清、或分成几类情况不齐全,或某些特殊的分析列式方法不熟悉等等。以下题为例: 有5本不同的书(A、B、C、D、E)分送给4个同学(甲、乙、丙、丁),每人至少1本,共有多少种分法?其中A书不送给甲而E书不送给丁的分法有多少种? 该题前半题对初学者来说常常因对题意
In the process of learning the arrangement and arrangement, even after learning the basic knowledge of ranking and arrangement, there are still many mistakes encountered in the column-type calculations when the relevant application problems are encountered. The concentrated performance is recalculation or omission. The reasons for this are often unclear whether the incident or order is unclear, or anatomical steps are not defined, or the categories are not complete, or some special analytical methods are not familiar with, etc. . The following questions are used as examples: There are 5 different books (A, B, C, D, E) distributed to 4 students (A, B, C, D), each with at least 1 copy. How many kinds of points are there? Among them, there are many kinds of divisions that A books don’t give to A and E books don’t give D?