MathDB

2

Part of 2018 Turkey Junior National Olympiad

Problems(1)

A combinatorics question about the chess table

Source: Turkey Junior Math Olympiad 2018 #2

1/10/2019
We are placing rooks on a nā‹…nn \cdot n chess table that providing this condition: Every two rooks will threaten an empty square at least. What is the most number of rooks?
combinatoricsCombinatorial games