Choose the odd numeral pair in each of the following questions :

Options

A. 10-20
B. 30-40
C. 40-50
D. 50-60

Answer

To solve the question of choosing the odd numeral pair from the given options, we will analyze each pair to identify the unique characteristic that sets one pair apart from the others.

### Step-by-Step Solution:

1. **Identify the Pairs**:
- Pair 1: 10 to 20
- Pair 2: 30 to 40
- Pair 3: 40 to 50
- Pair 4: 50 to 60

2. **Analyze Each Pair**:
- **Pair 1 (10 to 20)**: The second number (20) is twice the first number (10).
\[ 20 = 2 \times 10 \]
- **Pair 2 (30 to 40)**: The second number (40) is not twice the first number (30).
\[ 40 \neq 2 \times 30 \]
- **Pair 3 (40 to 50)**: The second number (50) is not twice the first number (40).
\[ 50 \neq 2 \times 40 \]
- **Pair 4 (50 to 60)**: The second number (60) is not twice the first number (50).
\[ 60 \neq 2 \times 50 \]

3. **Determine the Odd Pair**:
- From the analysis, we see that Pair 1 (10 to 20) is the only pair where the second number is exactly twice the first number. All other pairs do not have this characteristic.

4. **Conclusion**:
- Therefore, the odd numeral pair is **10 to 20**.

### Final Answer:
The odd numeral pair is **10 to 20**.