Go grid Go!
Source: Sri Lankan Mathematics Challenge Competition 2022
September 2, 2022
combinatoricsSri LankaTstst
Problem Statement
Problem 2 : number of unit squares selected from a square grid are coloured using five colours Red, Blue, Yellow, Green and Black such that each colour appears the same number of times and on each row and on each column there are no differently coloured unit squares. Find the maximum possible value of .