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标题: 问一道prep的题，高手指点 [打印本页]

作者: zhaog_ca 时间: 2008-4-7 04:11
标题: 问一道prep的题，高手指点

Did one of the 3 members of a certain team sell at least 2 raffle tickets yesterday?

(1) the 3 member sold a total of 6 raffle tickets yesterday.

(2)no 2 of the member sold the same member of raffle tickets yesterday?

ans

如何也想不通，高手请指教一下。多谢了

作者: xboytime 时间: 2008-4-7 05:21

(1) 3个人一共卖6个，至少有一个人买两个以上喽，要么不可能达到六个

(2) 没有两个成员卖的数目是一样的。那最少就是0,1,2喽，所以至少有一个人卖两个。。。

两个单独都成立

作者: zhaog_ca 时间: 2008-4-7 06:01
谢谢

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