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HMMT 二月 2006 · GEN1 赛 · 第 1 题

HMMT February 2006 — GEN1 Round — Problem 1

专题
Discrete Math / 离散数学
难度
L3
来源
HMMT

题目详情

  1. How many positive integers x are there such that 3 x has 3 digits and 4 x has four digits?
解析
  1. How many positive integers x are there such that 3 x has 3 digits and 4 x has four digits? Answer: 84 Solution: Note that x must be between 250 and 333, inclusive. There are 84 integers in that interval.