In each of the following questions, five (or four) numbers are given. Out of these four (or three) are alike in some way but rest one is different. Choose the one which is different from the other.

Options

A. 28
B. 45
C. 72
D. 81

Answer

To solve the problem, we need to identify which number among the given options is different from the others based on a common characteristic. The numbers provided are: 28, 45, 72, and 81.

### Step-by-Step Solution:

1. **List the Numbers**: We have the numbers 28, 45, 72, and 81.

2. **Identify Common Characteristics**: We will check if these numbers share any common mathematical properties, such as being multiples of a certain number.

3. **Check for Multiples of 9**:
- **45**: 45 is a multiple of 9 (9 x 5 = 45).
- **72**: 72 is a multiple of 9 (9 x 8 = 72).
- **81**: 81 is a multiple of 9 (9 x 9 = 81).
- **28**: 28 is not a multiple of 9.

4. **Conclusion**: Since 45, 72, and 81 are all multiples of 9, while 28 is not, we can conclude that 28 is the odd one out.

5. **Final Answer**: The number that is different from the others is **28**.