Iran TST
Source: Iranian TST 2019, first exam day 1, problem 1
June 24, 2019
combinatorics
Problem Statement
A table consisting of columns and rows, which are filled with zero and one numbers, are "varied", if no two lines are filled in the same way.\\
On the exterior of a cylinder, a table with rows and columns is constructed. Is it possible to fill the numbers cells of the table with numbers zero and one, such that any five consecutive columns, table created by these columns, is a varied one?Proposed by Morteza Saghafian