AMC 8 2020 Problem 12

AMC8 2020 年第 12

整除与因数★★★☆☆
For a positive integer n, the factorial notation n! represents the product of the integers from n to 1. (For example, 6! = 6 \cdot 5 \cdot 4 \cdot 3 \cdot 2 \cdot 1.) What value of N satisfies the following equation? 5! \cdot 9! = 12 \cdot N!
对一个正整数 n,符号 n!表示从 n 到 1 的所有整数的乘积。例如, 6!=6·5·4·3·2·3.2·1 则 N 为何值时,满足下面的方程?
  1. A.10
  2. B.11
  3. C.12
  4. D.13
  5. E.14

正确答案 · Correct Answer

A

解析 · Solution

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