Choose the one which does not belong to the group

5:18 6:23 3:11 1:3

5:18

The pattern which is being followed in the above question is: n: (n x 4) - 1 5:18 → 5 x 4 - 1 ≠ 18 6:23 → 6 x 4 - 1 = 23 3:11 → 3 x 4 - 1 = 11 1:3 → 1 x 4 - 1 = 3 Thus, the answer stands to be 5:18 as it does not follow the pattern.