MathDB

295

Part of 1980 All Soviet Union Mathematical Olympiad

Problems(1)

ASU 295 All Soviet Union MO 1980 red squares in infinite sheet of paper

Source:

7/19/2019
Some squares of the infinite sheet of cross-lined paper are red. Each 2×32\times 3 rectangle (of 66 squares) contains exactly two red squares. How many red squares can be in the 9×119\times 11 rectangle of 9999 squares?
Squarescombinatorial geometryrectanglepapercombinatoricsColoring