In every row, the first two grids combine to make the third grid. A square is coloured only if it is coloured in exactly one of the first two grids, and it keeps that colour. Which grid completes the last row?
In every row, the first two grids combine to make the third grid. A square is coloured only if it is coloured in exactly one of the first two grids, and it keeps that colour. Which grid completes the last row?