6 numbers in 26 one of them can be devided by the other 5 numbers .
Source: China Northern MO 2009 p3 CNMO
December 12, 2020
number theorydivides
Problem Statement
Given different positive integers , in any six numbers of the integers , there are at least two numbers , one can be devided by another. Then prove : There exists six numbers , one of them can be devided by the other five numbers .