126, 135, 144, 216, 154, 801

Options

A. 154
B. 216
C. 271
D. 801

Explanation

To solve the problem of identifying the odd number in the series 126, 135, 144, 216, 154, and 801, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Numbers in the Series**:
The numbers provided are: 126, 135, 144, 216, 154, and 801.

2. **Calculate the Sum of the Digits for Each Number**:
- For **126**:
- Sum = 1 + 2 + 6 = 9
- For **135**:
- Sum = 1 + 3 + 5 = 9
- For **144**:
- Sum = 1 + 4 + 4 = 9
- For **216**:
- Sum = 2 + 1 + 6 = 9
- For **154**:
- Sum = 1 + 5 + 4 = 10
- For **801**:
- Sum = 8 + 0 + 1 = 9

3. **Compare the Sums**:
- The sums of the digits for 126, 135, 144, 216, and 801 are all equal to 9.
- The sum of the digits for 154 is 10.

4. **Identify the Odd One Out**:
Since all the other numbers have a digit sum of 9, while 154 has a digit sum of 10, we can conclude that 154 is the odd number in the series.

### Conclusion:
The odd number in the series is **154**.