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1问题提出今年我市高三模拟考试中出现这样一个题目:A、B、C、D四人玩一项游戏,有1号、2号、3号、4号四个座位.已知A不坐1号位,B不坐2号位,C不坐3号位,D不坐4号位,则不同的坐法结果有种.这道题貌似简单,但考生用排列组合的常规方法求解,大多数人思维受阻.事实上这题可以用列举
A question put forward this year, the city’s high school mock exam appeared in such a topic: A, B, C, D four people play a game, there are 1, 2, 3, 4 seats. 1 bit, B does not sit on the 2nd bit, C does not sit on the 3rd bit, D does not sit on the 4th bit, then the different kinds of sitting results kind.This problem looks simple, but the examinee with the conventional method of permutation and combination, Most people are blocked in thinking. In fact, this question can be enumerated