一道gwd的ps题,,牛牛帮忙看看是我错了还是答案错了

nycxiaoqiu · 发表于 2010-8-24 10:20:09

There are 8 books on a shelf, of which 2 are paperbacks and 6 are hardbacks. How many possible selections of 4 books from this self include at least one paperback?
A.40
B.45
C.50
D.55
E.60
我怎么算来算去是D，答案却是选C？？？

nycxiaoqiu · 发表于 2010-8-24 10:59:27

怎么看过的人都不说话唉。。。

zhenzhu · 发表于 2010-8-24 11:10:51

我算是D 答案没问题么?

nycxiaoqiu · 发表于 2010-8-24 11:23:43

我算是D 答案没问题么?

-- by 会员 zhenzhu (2010/8/24 11:10:51)

不晓得唉...只有答案没有详解...哭...

一道gwd的ps题,,牛牛帮忙看看是我错了还是答案错了

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