In the following question on letter series analogy, KLMN is related to IJKL in a certain way. Using the same alphabetical pattern, TUVW is related to which of the following letter groups?

Introduction / Context:
This letter analogy problem is based on shifting letters backward in the alphabet. The first group KLMN changes to IJKL, and we must determine how the same type of change would apply to the second group TUVW. Such questions strengthen understanding of positional shifts within the English alphabet, an important foundation for many coding and decoding problems in aptitude tests.

Given Data / Assumptions:

• First pair of letter groups: KLMN : IJKL
• Second first term: TUVW
• We use the English alphabet where A is 1 and Z is 26.
• We must pick the option that follows the same letter shift rule.

Concept / Approach:
The approach is to convert letters into their positions and then observe the change for each position. If the difference from each letter in KLMN to the corresponding letter in IJKL is constant, that difference becomes the rule. We can then apply the same difference to each letter of TUVW. This type of problem is usually based on a simple addition or subtraction like plus two or minus two.

Step-by-Step Solution:
Step 1: Convert KLMN into positions. K is 11, L is 12, M is 13, and N is 14. Step 2: Convert IJKL into positions. I is 9, J is 10, K is 11, and L is 12. Step 3: Compute the differences. From K to I the change is 11 minus 2 equals 9. From L to J the change is 12 minus 2 equals 10. From M to K the change is 13 minus 2 equals 11. From N to L the change is 14 minus 2 equals 12. So the rule is to subtract 2 from each letter position. Step 4: Apply the same rule to TUVW. Positions: T is 20, U is 21, V is 22, W is 23. Step 5: Subtract 2 from each. T minus 2 is 18 which is R. U minus 2 is 19 which is S. V minus 2 is 20 which is T. W minus 2 is 21 which is U. Step 6: Combine the resulting letters to form RSTU.

Verification / Alternative check:
We can verify by quickly checking the final result against the options. RSTU appears as one of the given choices and is produced by a clean and consistent minus two shift applied to each letter. Any other option would require different shifts that do not match the original mapping from KLMN to IJKL. Thus the analogy remains valid only if we select RSTU as the correct related group.

Why Other Options Are Wrong:
RSUT changes the internal order of letters and does not correspond to a uniform minus two shift. VWXY is actually a forward continuation from TUVW and would require a plus one rule, which contradicts the minus two transformation seen in the first pair. STUV leaves one letter unchanged and alters the pattern, again failing to match the systematic shift. Therefore these options are inconsistent with the rule discovered from the first pair.

Common Pitfalls:
Learners sometimes focus only on the first letter and ignore the rest, which can lead to incorrect guesses such as picking an option with R at the start but not verifying the sequence. Another mistake is to confuse minus one and minus two shifts due to mental calculation errors. It is important to check each letter one by one and ensure the same operation applies uniformly. Writing down positions on paper often helps avoid such mistakes.

Final Answer:
Using the same rule as KLMN : IJKL, the group of letters related to TUVW is RSTU.