In this letter series reasoning question, select the odd group of letters from the following alternatives based on the pattern of alphabetical jumps.

Introduction / Context:
This logical reasoning question presents four groups of letters and asks you to identify the odd group. The test here is your ability to see consistent jumps between letters in the alphabet. Such questions are standard in series and coding topics, where recognizing patterns like constant differences between letter positions is important.

Given Data / Assumptions:
- The options are CEG, IKM, ORU, and VXZ.- Each group contains three letters arranged in alphabetical order.- The likely pattern is the difference between consecutive letter positions in the alphabet.

Concept / Approach:
The most systematic method is to convert each letter to its numerical position in the alphabet and then compute the differences between consecutive letters in each group. If three groups show one type of difference and one group shows a different type, that different group will be the odd one out. This technique reduces confusion and prevents random guessing.

Step-by-Step Solution:
Step 1: For CEG, the letters are C, E, G with positions 3, 5, 7. Differences are +2 and +2.Step 2: For IKM, the letters are I, K, M with positions 9, 11, 13. Differences are again +2 and +2.Step 3: For ORU, the letters are O, R, U with positions 15, 18, 21. Differences are +3 and +3.Step 4: For VXZ, the letters are V, X, Z with positions 22, 24, 26. Differences are +2 and +2.Step 5: Three groups CEG, IKM, and VXZ use a constant jump of 2, while ORU uses a larger jump of 3.

Verification / Alternative check:
You can quickly recite the sequences: C, E, G; I, K, M; and V, X, Z all skip one letter between each pair. However, O, R, U skips two letters between successive letters. This verbal check supports the numerical observation.

Why Other Options Are Wrong:
CEG: Follows a +2 pattern and is consistent.IKM: Also follows a +2 pattern.VXZ: Again shows the same +2 jump between letters.

Common Pitfalls:
Some students focus only on whether letters are consonants or vowels, but that does not help here. The important feature is how far each letter is from the next one in the alphabet.

Final Answer:
The odd letter group is ORU because it uses a jump of 3 between letters instead of a jump of 2.