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GWD-4-5
A certain club has 20 members. What is the ratio of the member of 5-member committees that can be formed from the members of the club to the number of 4-member committees that can be formed from the members of the club?
16 to 1
15 to 1
16 to 5
15 to 6
5 to 4
算不不来 ，看人家解析 C(5,20)/C(4,20）不知道什么意思 |
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