请教2题

cxks01 · 发表于 2011-11-2 19:58:39

这两题，求思路。读不太懂题目，特别第二题。第一题的话7选1和10选2，意思是一共17个人还是一共10个人，如果一共17个人，那none of the candidates is eligible for a position in both departments这个条件有什么用？
1.A certain university will select 1 of 7 candidates eligible to fill a position in the mathematics department and 2 of 10 candidates eligible to fill 2 identical positions in the computer science department.If none of the candidates is eligible for a position in both departments, how many different sets of 3 candidates are there to fill the 3 positions?

2.A total of 30 percent of the geese included in a certain migration study were male.If some of the geese migrated during the study and 20 percent of the migrating geese were male, what was the ratio of the migration rate for the male geese to the migration rate for the female geese?
[Migration rate for geese of a certain sex = (number of geese of that sex migrating) / (total number of geese of that sex)]

cxks01 · 发表于 2011-11-3 10:40:20

高手~高手~在哪里

jxchen · 发表于 2011-11-3 10:55:15

1. 315
2. 十二分之七

cxks01 · 发表于 2011-11-3 21:13:58

能给个思路或过程吗

请教2题

所属分类: GMAT考试

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