AMC 8 2015 Problem 11
AMC8 2015 年第 11 题
概率★★★☆☆
In the small country of Mathland, all automobile license plates have four symbols. The first symbol must be a vowel ( A, E, I, O, or U ), the second and third symbols must be two different letters among the 21 non-vowels in the alphabet, and the fourth symbol must be a digit ( 0 through 9 ). If the symbols are chosen at random subject to these conditions, what is the probability (In fractions) that the plate will read " AMC8 "?
在 Mathland 这个小国家,所有汽车的牌照都有 4 个符号。第一个符号必须是个韵母(A,E,I,O 或 U),第二个和第三个符号必须是 21 个非韵母中不同的两个字母,第四个必须是一个数字 (0 到 9),如果符号都是按照这些规则随机选择的,那么牌照上显示的是"AMC8"概率是多少?
- A.
- B.
- C.
- D.
- E.
正确答案 · Correct Answer
B
解析 · Solution
解析整理中
继续练习