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标题: GWD-18-13 [打印本页]

作者: dbearwangs 时间: 2005-11-13 07:13 标题: GWD-18-13

Q13:

Each of 20 parents chose one of five days from Monday through Friday to attend parent-teacher conferences. If more parents chose Monday than Tuesday, did at least one of the parents choose Friday?

(1) None of the five days was chosen by more than 5 parents.

(2) More parents chose Monday than Wednesday.

Why not A?

作者: LHL888 时间: 2005-11-13 18:51

1. 5x4 left none chooses Friday. 没有一天有超过5人,那么5人就不能算超过5人.

2. gone

ft, E is wrong, C: MTW = 5+4+4 = 13, ThF = 20-13=7, but Th<=5, so F>=2

作者: lololo 时间: 2005-11-14 07:24

我也支持A.

作者: dbearwangs 时间: 2005-11-15 12:59

哦,明白了,偶看成要求MAY 1的金额了.

谢谢

作者: casualwalk 时间: 2005-11-17 06:58

more parents chose Monday than Tuesday A

作者: rainyliu 时间: 2005-11-20 01:31

我觉得是A

已经知道说1）Monday人数比Tue人数多，2）每天不超过5人

所以MTWTh的总人数最大值为5+4+5+5=19，那么Friday就肯定有人预约了。

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