AMC 8 2017 Problem 20

AMC8 2017 年第 20

概率★★★☆☆
An integer between 1000 and 9999, inclusive, is chosen at random. What is the probability that it is an odd integer whose digits are all distinct?
从 1000 到 9999 之间(包含 1000 和 9999)随机选择一个整数,问这个数是一个各个位上数字都不一样的奇数的概率是多少?
  1. A.1475\displaystyle \frac{14}{75}
  2. B.56225\displaystyle \frac{56}{225}
  3. C.107400\displaystyle \frac{107}{400}
  4. D.725\displaystyle \frac{7}{25}
  5. E.925\displaystyle \frac{9}{25}

正确答案 · Correct Answer

B

解析 · Solution

解析整理中

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