题目内容

从数1,2,3,4中任取一个数,记为X,再从1,2,…,X中任取一个数,记为Y,则P{Y=2}=____ 。(分数的分号用:/)

查看答案

搜索结果不匹配？点我反馈

更多问题

Excuse me, how can I ____ the post office?

A. get up
B. get on
C. get to
D. get down

—Excuse me, which is the way to the museum?—Go down this road ____, and you’ll see it on your left.

A. by the end
B. at the end
C. in the end
D. to the end

—_____ is the railway station from here?—About 3 kilometers.

A. How long
B. How far
C. How much
D. How many

It’s good the old the bus.

A. to help; get on
B. to help; to get
C. help; get on
D. help; to get