In the following question on alphabet patterns, four three letter groups are given (DGJ, KNQ, RUX and ILN). In three groups, the letters progress with equal jumps in the alphabet, while one group breaks this regular pattern. Select the odd letters from the given alternatives.

Introduction / Context:
This reasoning question focuses on detecting regular patterns in sequences of letters. The groups DGJ, KNQ, RUX and ILN all look similar, but most of them follow a clean progression rule based on fixed jumps in the English alphabet. Your job is to find which group does not follow the same jump pattern and mark it as the odd one out.

Given Data / Assumptions:

• Letter groups: DGJ, KNQ, RUX and ILN.
• Alphabet positions: A = 1, B = 2, C = 3, ..., Z = 26.
• Each group contains three letters arranged in a certain pattern.
• Three groups show equal jumps between consecutive letters, while one group shows a different jump.
• We consider only alphabetical positions, not pronunciation or meaning.

Concept / Approach:
The approach is to convert each letter to its numerical alphabet position and examine the differences between consecutive letters inside each group. If in three groups the differences are the same (for example +3, +3) and in one group the pattern changes (for example +3, +2), then the group with the different difference is the odd one. This technique of checking position differences is standard in alphabet series and coding questions.

Step-by-Step Solution:
Step 1: Analyse DGJ.D = 4, G = 7, J = 10. Differences: 7 - 4 = 3, 10 - 7 = 3. So DGJ follows a +3, +3 pattern.Step 2: Analyse KNQ.K = 11, N = 14, Q = 17. Differences: 14 - 11 = 3, 17 - 14 = 3. KNQ also follows a +3, +3 pattern.Step 3: Analyse RUX.R = 18, U = 21, X = 24. Differences: 21 - 18 = 3, 24 - 21 = 3. RUX again follows a +3, +3 pattern.Step 4: Analyse ILN.I = 9, L = 12, N = 14. Differences: 12 - 9 = 3, 14 - 12 = 2. ILN follows a +3, +2 pattern.Step 5: Identify the odd group.Since DGJ, KNQ and RUX all use +3, +3 jumps, and ILN uses +3, +2 jumps, ILN is the odd letter group.

Verification / Alternative check:
A quicker check once you know the pattern is to write the letters one below the other and see if they align diagonally with equal spacing: D, G, J; K, N, Q; R, U, X all show a neat step of three letters each time. When you write I, L, N, you notice that L is three steps after I but N is only two steps after L. This visual difference confirms that ILN breaks the otherwise uniform pattern of constant jumps.

Why Other Options Are Wrong:
DGJ: Follows the rule of equal +3 jumps between letters, so it is not odd.
KNQ: Also follows the +3, +3 jump pattern and belongs with DGJ and RUX.
RUX: Again uses +3, +3 jumps, so it matches the main pattern of the question.

Common Pitfalls:
Some candidates may quickly decide based on visual familiarity or because a group contains letters that appear less often in words. However, alphabet series questions almost always rely on consistent positional patterns rather than word frequency or pronunciation. Always convert letters to numbers and systematically check the differences. This habit makes such questions straightforward and reduces guessing.

Final Answer:
The odd letter group is ILN, because its letters increase by +3 and then +2, while the other three groups all increase by +3 and +3 in the alphabet.