MathDB

519

Part of 1990 All Soviet Union Mathematical Olympiad

Problems(1)

ASU 519 All Soviet Union MO 1990 bw color in 1990 x 1990 chessboard

Source:

8/14/2019
Can the squares of a 1990×19901990 \times 1990 chessboard be colored black or white so that half the squares in each row and column are black and cells symmetric with respect to the center are of opposite color?
Chessboardsquare tableColoringcombinatorics