五张卡片上分别写上字母E、E、B、B、B， 将五张卡片随机地排成一行，恰好排成英文单词 BEBEB或BBBEE的概率为：

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='31553' and id < 2527805 and id<>'2527805' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='31553' and id > 2527805 and id<>'2527805' order by id asc limit 5