元素不相邻的计数问题经常会出现在竞赛、高考以及高校自主招生考试的试卷中,解决此类问题的基本方法是插空法.下面通过几个经典的例题来盘点一下用插空法解此类问题的基本策略,以期能对大家的学习有所启发和帮助.一、先转化再插空例1将6把椅子摆成一排,3个人随机就坐,任何2个人不相邻的坐法种数为() The non-adjacent elements of the counting problems often appear in competitions, college entrance examination and university self-enrollment examination papers, the basic method to solve such problems is emptiness law. The following examples through a few classic to inventory emptied method The basic strategy of such issues, with a view to be able to inspire and help everyone learning First, the first conversion and then insert empty case 1 will be placed in a row of 6 chairs, 3 people sit at random, any 2 people are not sitting around The number of species ()