MathForces: Math Olympiads
MathForces - Math Olympiadsβeta
Login Register

Revolution

Author: mathforces
Problem has been solved: 17 times

Русский язык | English Language



Katrina wants to arrange 8 rooks on а $9\times 9$ chessboard so that no two rooks attack each other and all rooks are located on cells of the same color. In how many ways can she do it?





Sorry, you need to login into your account