`{:(A,B,C,D,E,F,G,H,I,J,K,L,M),(1,2,3,4,5,6,7,8,9,10,11,12,13),(N,O,P,Q,R,S,T,U,V,W,X,Y,Z),(14,15,16,17,18,19,20,21,22,23,24,25,26):}`
In each of the following questions, four groups of letters are given, three of them are alike in a certain way while one is different. Choose the odd one.

Options

A. RSXY
B. NOUV
C. MNST
D. DEJK

Answer

To solve the problem of identifying the odd group of letters among the given options, we will analyze each group based on the pattern of letter progression.

### Step-by-Step Solution:

1. **Identify the Groups**: The four groups of letters are:
- Group 1: R, S, X, Y
- Group 2: N, O, U, V
- Group 3: M, N, S, T
- Group 4: D, E, J, K

2. **Analyze Group 1 (R, S, X, Y)**:
- R to S: 1 step forward (R → S)
- S to X: 5 steps forward (S → T → U → V → W → X)
- X to Y: 1 step forward (X → Y)
- **Pattern**: The pattern is +1, +5, +1.

3. **Analyze Group 2 (N, O, U, V)**:
- N to O: 1 step forward (N → O)
- O to U: 6 steps forward (O → P → Q → R → S → T → U)
- U to V: 1 step forward (U → V)
- **Pattern**: The pattern is +1, +6, +1.

4. **Analyze Group 3 (M, N, S, T)**:
- M to N: 1 step forward (M → N)
- N to S: 5 steps forward (N → O → P → Q → R → S)
- S to T: 1 step forward (S → T)
- **Pattern**: The pattern is +1, +5, +1.

5. **Analyze Group 4 (D, E, J, K)**:
- D to E: 1 step forward (D → E)
- E to J: 5 steps forward (E → F → G → H → I → J)
- J to K: 1 step forward (J → K)
- **Pattern**: The pattern is +1, +5, +1.

6. **Compare the Patterns**:
- Group 1: +1, +5, +1
- Group 2: +1, +6, +1
- Group 3: +1, +5, +1
- Group 4: +1, +5, +1

7. **Identify the Odd One Out**:
- Groups 1, 3, and 4 all follow the same pattern of +1, +5, +1.
- Group 2 follows a different pattern of +1, +6, +1.

### Conclusion:
The odd group out is **Group 2: N, O, U, V**.

---