Who is the closest to 1 / 2 in 7 / 8, 5 / 9, 13 / 12, 23 / 47, 8 / 15, 4 / 12 and 17 / 18

Who is the closest to 1 / 2 in 7 / 8, 5 / 9, 13 / 12, 23 / 47, 8 / 15, 4 / 12 and 17 / 18

seventeen-eighteenths