The sum of fractions 1/6 and 1/4 =
4/24 + 6/24 = 10/24 (so no)
The sum of fractions 1/3 and 1/8 =
8/24 + 3/24 = 11/24 (Yes)
The sum of fractions 1/2 and 1/12 =
12/24 + 2/24 = 14/24 (so no)
The sum of fractions 1/2 and 5/12 =
12/24 + 10/24 = 22/24 (so no)