4. In your answer sheet, there is a 4 × 4 board. Shade 4 of the 16 squares so that
no two shaded squares lie on the same vertical, horizontal or diagonal path.
Below is an illustration of the paths.
Bạn đang xem 4. - ĐỀ THI TOÁN QUỐC TẾ PMWC VÒNG CÁ NHÂN
