In the question below there are four groups. Each group consists of either one number and two letters or two numbers and one letter. Four of these five groups follow one group which does not follow the same principle. Find correct answer.

Options

A. B, 7, L
B. D, 9, N
C. L, 9, F
D. G, 12, Q

Answer

To solve the problem, we need to analyze the four groups provided and determine which one does not follow the same principle. The groups consist of either one number and two letters or two numbers and one letter. We will calculate the face values of the letters and check if they follow a specific rule.

### Step-by-Step Solution:

1. **Identify the Groups**: Let's denote the four groups as follows:
- Group 1: B7L
- Group 2: D9N
- Group 3: L9F
- Group 4: G12Q

2. **Calculate Face Values**:
- The face values of the letters are:
- A = 1, B = 2, C = 3, D = 4, E = 5, F = 6, G = 7, H = 8, I = 9, J = 10, K = 11, L = 12, M = 13, N = 14, O = 15, P = 16, Q = 17, R = 18, S = 19, T = 20, U = 21, V = 22, W = 23, X = 24, Y = 25, Z = 26.

3. **Analyze Each Group**:
- **Group 1: B7L**
- Face value of B = 2
- Face value of L = 12
- Average = (2 + 12) / 2 = 14 / 2 = 7 (Matches)

- **Group 2: D9N**
- Face value of D = 4
- Face value of N = 14
- Average = (4 + 14) / 2 = 18 / 2 = 9 (Matches)

- **Group 3: L9F**
- Face value of L = 12
- Face value of F = 6
- Average = (12 + 6) / 2 = 18 / 2 = 9 (Matches)

- **Group 4: G12Q**
- Face value of G = 7
- Face value of Q = 17
- Average = (7 + 17) / 2 = 24 / 2 = 12 (Matches)

4. **Identify the Odd Group**:
- All groups seem to match the average rule except for Group 3 (L9F), where the face value of L (12) is greater than the face value of F (6). This does not follow the principle that the first letter's face value should be less than the second letter's face value.

### Conclusion:
The group that does not follow the same principle is **Group 3: L9F**.