# Which One Does not Belong to the Group?

Three of the following four are alike in a certain way and hence form a group. Which one does not belong to the group?

- 12
- 21
- 28
- 51

**Answer: (3) 28**

**Explanation:-**

28 is divisible by 3 but rest are divisible by 3 .

Hence, the answer is (3) 28