Choose the one which does not belong to the group.

The pattern which is being followed is:

(Number x 7) : (Number x 8)

21:24 → (3 x 7): (3 x 8)

28:32 → (4 x 7): (4 x 8)

14:16 → (2 x 7): (2 x 8)

54:62 → The pattern does not follow for this. Hence, would be the answer.