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Question

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 pair 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.)

This question was previously asked in
RRB NTPC 2024 Undergraduate CBT 1 Question Paper (29-Aug-2025) (Shift 1)
The correct answer is
LP-NR

Analyzing Letter Pairs in Alphabetical Order

The question asks us to identify which pair of letter clusters is different from the others based on a pattern related to the English alphabetical order. We need to find the 'odd one out' among the given pairs. The note clarifies that the pattern isn't about vowels, consonants, or their positions within a cluster, but rather the relationship between the pairs themselves.

Step-by-Step Analysis of Pairs

Let's examine each pair by looking at the alphabetical position of each letter:

Pair 1: FK-IN

  • F is the 6th letter, K is the 11th letter.
  • I is the 9th letter, N is the 14th letter.
  • Comparing the first letters: F (6) to I (9). The difference is \(9 - 6 = 3\).
  • Comparing the second letters: K (11) to N (14). The difference is \(14 - 11 = 3\).
  • Pattern: The letters in the second cluster (IN) are 3 positions after the corresponding letters in the first cluster (FK).

Pair 2: DI-GL

  • D is the 4th letter, I is the 9th letter.
  • G is the 7th letter, L is the 12th letter.
  • Comparing the first letters: D (4) to G (7). The difference is \(7 - 4 = 3\).
  • Comparing the second letters: I (9) to L (12). The difference is \(12 - 9 = 3\).
  • Pattern: The letters in the second cluster (GL) are 3 positions after the corresponding letters in the first cluster (DI).

Pair 3: LP-NR

  • L is the 12th letter, P is the 16th letter.
  • N is the 14th letter, R is the 18th letter.
  • Comparing the first letters: L (12) to N (14). The difference is \(14 - 12 = 2\).
  • Comparing the second letters: P (16) to R (18). The difference is \(18 - 16 = 2\).
  • Pattern: The letters in the second cluster (NR) are 2 positions after the corresponding letters in the first cluster (LP).

Pair 4: QV-TY

  • Q is the 17th letter, V is the 22nd letter.
  • T is the 20th letter, Y is the 25th letter.
  • Comparing the first letters: Q (17) to T (20). The difference is \(20 - 17 = 3\).
  • Comparing the second letters: V (22) to Y (25). The difference is \(25 - 22 = 3\).
  • Pattern: The letters in the second cluster (TY) are 3 positions after the corresponding letters in the first cluster (QV).

Identifying the Odd Pair Out

By comparing the patterns identified in each pair:

  • FK-IN follows a +3 shift for both letters.
  • DI-GL follows a +3 shift for both letters.
  • QV-TY follows a +3 shift for both letters.
  • LP-NR follows a +2 shift for both letters.

The pairs FK-IN, DI-GL, and QV-TY all share the same pattern (a shift of +3 positions between the clusters). The pair LP-NR has a different pattern (a shift of +2 positions). Therefore, LP-NR is the pair that does not belong to the group.

Conclusion

The pair LP-NR does not follow the same alphabetical progression rule as the other pairs. Hence, it is the odd one out.

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