贴错的情况共有几种

  • 时间:2020-06-17 18:37:02
  • 分类:数学世界
  • 阅读:137 次

 贴错的情况共有几种:四个装药用的瓶子都贴了标签,其中恰好有三个贴错了,那么错的情况共有()种。

数学题解答:解答这一题需要用列举法。假设四个瓶子分别为一、二、三、四,而标签分别用①、②、③、④,如果一号没有错,那么有2种情况,列举出来就是:

一①、二③、三④、四②一①、二④、三②、四③

如果帖对的不是一号,而是二号、或者三号、或者四号,那么又各有两种情况,所以一共有:2 × 4 = 8(种),答:帖错的情况一共有8种。

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