Question 9
What number should replace the question mark? The three hexagons, with numbers read as left-hand column (top to bottom) and right-hand column (top to bottom), are: first 2, 3, 6 and 4, 7, 2; second 1, 9, 7 and 3, 9, 4; third 4, 1, 8 and 8, 3, ?. Answer with a natural number.
