Based on the English alphabetical order, three of the following four letter cluster pairs are alike in a certain way and thus form a group. Which is the one that does not belong to that group?

(Note: The odd one out is not based on the number of consonants/vowels or their position in the letter cluster)9966

1. A

   BL – TY

2. B

   EO-VB

3. C

   LV – CI

4. D

   RB-IO

Appeared in: RRB Nsg. Superintendent-2026 (Shift -1st)

Explanation

• The question requires identifying the odd one out from four letter-cluster pairs based on a hidden pattern.
• The pattern is based on the numerical difference between the letters in each cluster, using their positions in the English alphabet (A=1, B=2, etc.).
• In the pair BL-TY, the difference in the first cluster (BL) is 10 (L-B = 12-2), and the difference in the second cluster (TY) is 5 (Y-T = 25-20).
• This pattern of (10, 5) is different from the other three options, which all follow a (10, 6) pattern.

Why Other Options Were Wrong

• Option B: This option follows the group's common pattern. The difference in EO is 10 (15-5), and the difference in VB is 6 ((22+6) mod 26 = 2). This makes it part of the group, not the odd one out.
• Option C: This option follows the group's common pattern. The difference in LV is 10 (22-12), and the difference in CI is 6 (9-3). This makes it part of the group, not the odd one out.
• Option D: This option follows the group's common pattern. The difference in RB is 10 ((18+10) mod 26 = 2), and the difference in IO is 6 (15-9). This makes it part of the group, not the odd one out.

Related Visual

• Visual 1: Chart - A chart displaying the English alphabet with corresponding numerical positions (A=1, B=2, etc.) to help visualize the calculations.
• Visual 2: Infographic - An infographic breaking down the calculation for each option, highlighting the (10, 6) pattern in the three similar pairs and the (10, 5) pattern in the odd one out.

Clinical Relevance

• Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Logical Reasoning - Letter Series Pattern Recognition as background academic context rather than a clinical decision trigger.
• This is a logical reasoning question designed to test analytical and pattern-recognition skills.
• These skills are valuable in nursing for tasks like interpreting data charts, recognizing trends in vital signs, and making quick, logical decisions under pressure.
• While not directly clinical, strong reasoning ability is a foundational skill for effective nursing practice.

How to Approach the Question

• First, understand the task: you need to find the pair that doesn't fit the pattern of the other three.
• Assign numerical values to each letter based on its position in the alphabet (A=1, B=2, ... Z=26).
• For each option, calculate the difference between the letters in the first cluster and the second cluster.
• Look for a consistent pattern of differences across the options. Three of the options will share this pattern.
• Identify the option where the calculated differences do not match the common pattern. This will be the correct answer.

Concept Tested & Keywords

• Concept Tested: Logical Reasoning - Letter Series Pattern Recognition
• Stem keywords: English alphabetical order, letter cluster pairs, alike, does not belong
• Lead-in keywords: Which is the one that does not belong
• Negative lead-in flag: NOT changes the reasoning strategy; look for the exception or incorrect statement rather than the true statement.

Question ID

QASrIN0pR1wNfhxWAT5Cwq

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