In the following question, groups of three letters are given. Three of these groups have letters with a fixed gap of 2 between consecutive letters in the alphabet, while one group has consecutive letters with a gap of 1. Select the odd group of letters from the given alternatives.

Introduction / Context:
This question is from the letter series and alphabetical reasoning part of aptitude. You are given several triplets of letters and asked to find which one does not follow the same spacing rule as the others. Such questions are very common and help train you to notice regular steps and patterns in the alphabet, which are later used in coding decoding and sequence based problems.

Given Data / Assumptions:
- The options are JKL, EGI, OQS, KMO, and BDF.
- We use positions A = 1, B = 2, ..., Z = 26.
- In most groups, the difference between consecutive letters is +2, that is, there is one letter between them in the alphabet.

Concept / Approach:
The method is to convert each letter to its numerical position and compute the difference between the first and second letters and between the second and third letters. For a regular pattern, these differences should be equal and match across multiple options. The group which has a different spacing, such as consecutive letters with a gap of 1, will be the odd one out.

Step-by-Step Solution:
Step 1: For EGI, positions are E = 5, G = 7, I = 9. Differences are 7 - 5 = 2 and 9 - 7 = 2, so this group follows a +2, +2 pattern.Step 2: For OQS, positions are O = 15, Q = 17, S = 19. Differences are again +2 and +2, so OQS also follows the same pattern.Step 3: For KMO, positions are K = 11, M = 13, O = 15. Differences are 13 - 11 = 2 and 15 - 13 = 2, so KMO fits the +2, +2 rule.Step 4: For BDF, positions are B = 2, D = 4, F = 6. Differences are 4 - 2 = 2 and 6 - 4 = 2, so BDF also follows the same gap of 2.Step 5: For JKL, positions are J = 10, K = 11, L = 12. Here the differences are 11 - 10 = 1 and 12 - 11 = 1, so the letters are consecutive with gap 1, not 2.Step 6: Therefore, JKL is the only triplet that does not have a constant gap of 2 between letters and is the odd one out.

Verification / Alternative check:
You can read the sequences aloud to sense the rhythm. E, G, I; O, Q, S; K, M, O; and B, D, F all sound like letters with one letter skipped between each step. J, K, L feels different because the letters are immediate neighbours with no letter skipped. This difference in rhythm confirms that JKL is the group that does not match the spacing pattern of the others.

Why Other Options Are Wrong:
EGI, OQS, KMO, and BDF all share the exact same structure, where each letter is followed by another letter that is two positions ahead in the alphabet. Because they all follow the +2, +2 rule, they belong to the same family of patterns. None of them can be considered odd when compared with a triplet like JKL that uses a completely different spacing.

Common Pitfalls:
Students sometimes focus only on whether letters are increasing and ignore the exact step size. As a result, they may wrongly treat JKL as similar to the others. To avoid this, always check the numeric difference between letters and compare that difference across options. This small habit dramatically improves accuracy in letter series and coding questions.

Final Answer:
JKL