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[海外机考实录] 7-25-08 数学 [复制链接]

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发表于 2008-7-27 09:07:49 |只看该作者 |倒序浏览
can any one please show me how to solve the folloing problems? thanks!!

1. Given that 500 people are asked 2 questions and both questions canbe answered either yes or no. If 410 said yes for first and 220 saidyes for second, then how many answered both?

2. For a party, 2 types of dishes are to beselected. For the first type of dish 2 are to be selected from 4 andfor second type of dish 4 are to be selected from 5. In how many wayscan these both(1st & 2nd) type of dishes selected?

[ 本帖最后由 Adamas 于 2009-1-4 03:21 编辑 ]
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沙发
发表于 2008-7-27 09:38:50 |只看该作者
Let me try

1.  between 130 and 220

2. 30

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板凳
发表于 2008-7-28 07:07:44 |只看该作者
1。 130
410+220—500=130
2    30

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地板
发表于 2008-7-28 14:20:56 |只看该作者

to #3

look, it is not a question about set.
In my opinion, the 220 people who said yes can also belong to the 410 people who said yes for the first.
Another possiblity is that the first time 90 saying no people are included in the 220 people.
So I think the number should between 130 and 220

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发表于 2008-7-28 15:20:25 |只看该作者

回复 #4 emily-2008 的帖子

恩,对。应该 是130-220之间,谢谢

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RE: 7-25-08 数学 [修改]
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7-25-08 数学
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