AMC 8 1999 Problem 15
AMC8 1999 年第 15 题
基本计数原理★★★☆☆
Bicycle license plates in Flatville each contain three letters. The first is chosen from the set {C,H,L,P,R}, the second from {A,I,O}, and the third from {D,M,N,T}. When Flatville needed more license plates, they added two new letters. The new letters may both be added to one set or one letter may be added to one set and one to another set. What is the largest possible number of ADDITIONAL license plates that can be made by adding two letters?
的自行车牌照各包含三个字母。第一个从 {C,H,L,P,R} 中选择，第二个从 {A,I,O} 中选择，第三个从 {D,M,N,T} 中选择。 当 Flatville 需要更多牌照时，他们新增了两个新字母。这两个新字母可以都加入一个集合，或者一个字母加入一个集合、另一个加入另一个集合。通过添加两个字母，最多可以增加多少额外的牌照？
- A.24
- B.30
- C.36
- D.40
- E.60
正确答案 · Correct Answer
D
解析 · Solution
解析整理中
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