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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