ChaseDream
标题: 一道prep题目望大神们帮助一下 [打印本页]
作者: 猫七 时间: 2018-10-8 10:20
标题: 一道prep题目望大神们帮助一下
Is the positive integer x divisible by each integer from 2 through 6 ?
(1) x = 10m, where m is a positive integer divisible by each integer from 2 through 5.
(2) 10x = n, where n is a positive integer divisible by each integer from 2 through 9.
OA:A
请问各位大神,条件一:10的factor是 1,10,2,5; M的factor是 2,3,4,5;那么X的factor只有2~5? 没有到6呀?为什么选A呢?
作者: gin.gins 时间: 2018-10-8 10:49
这道题我刚好做过。因为m可以被2,3,4,5整除,x = 10m = 2 * 5m, 所以x里一定包含 2 * 3=6这个因子。
欢迎光临 ChaseDream (https://forum.chasedream.com/) |
Powered by Discuz! X3.3 |