作者windton (感谢所有人的帮忙)
站内GMAT
标题Re: [计量] GWD 24-04 以及 GWD 23-30
时间Wed Jun 11 21:48:49 2008
※ 引述《PINKENVI (非要考好不可!)》之铭言:
: GWD 23
: Q30:
: 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
: 答案是C
: 我算法是 C(8,4)-C(6,4)=55 结果得出来答案是C @@
其实我看不懂....
你式子列对了啊
结果你答案是50?
计算错误吧。
: 也是同一类型题
: GWD 24
: 4
: A shipment of 8 television sets contains 2 black-and-white sets
: and 6color sets. If 2 television sets are to be chosen at random
: from this shipment, what is the probability that at least 1 of
: the 2 sets chosen will be a black-and-white set?
: A.1/7
: B.1/4
: C.5/14
: D.11/28
: E.13/26
: 答案是E
: 我觉得这两种题目应该是用同一种方法算阿?!
: 可是不知道为啥跟答案不太一样?
: 是答案有误还是我误解了?
: 请各位帮忙! ^_^
: 谢谢!
答案有问题
这题是 13/28
算法是一样的:)
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1F:推 Engedi:原po的数学不会是来自涛涛31套吧? 那版数学错不少说 06/11 21:51
2F:推 PINKENVI:所以两者算法都一样吧???? 06/11 22:40
3F:→ PINKENVI:回E大:应该就是31套吧!不是大家都做这一套吗?哈! 06/11 22:41