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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 letter-cluster 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 ALP 2025 CBT 2 Wiremen Question Paper (28-Jul-2026) (Shift 2)
The correct answer is
PT - MR

Reasoning: Identifying the Odd Letter Cluster Pair

The goal is to find the letter-cluster pair that does not follow the same logical pattern as the other three, based on English alphabetical order.

Analyzing Letter Cluster Patterns

We examine each option by assigning numerical positions to letters (A=1, B=2, ..., Z=26) and checking the relationships within and between the clusters.

  • Option 1: PT - MR
    • Cluster 1 (PT): P is the 16th letter, T is the 20th. Difference: \( 20 - 16 = 4 \).
    • Cluster 2 (MR): M is the 13th letter, R is the 18th. Difference: \( 18 - 13 = 5 \).
    • Relationship: M is 3 letters before P (\( 13 - 16 = -3 \)). R is 2 letters before T (\( 18 - 20 = -2 \)).
    • This pair deviates because the internal difference is 5 (not 4) and the relationship between the second letters is -2 (not -3).
  • Option 2: EI - BF
    • Cluster 1 (EI): E is the 5th letter, I is the 9th. Difference: \( 9 - 5 = 4 \).
    • Cluster 2 (BF): B is the 2nd letter, F is the 6th. Difference: \( 6 - 2 = 4 \).
    • Relationship: B is 3 letters before E (\( 2 - 5 = -3 \)). F is 3 letters before I (\( 6 - 9 = -3 \)).
    • This pair follows the pattern: internal difference is 4, and the difference between corresponding letters is -3.
  • Option 3: NR - KO
    • Cluster 1 (NR): N is the 14th letter, R is the 18th. Difference: \( 18 - 14 = 4 \).
    • Cluster 2 (KO): K is the 11th letter, O is the 15th. Difference: \( 15 - 11 = 4 \).
    • Relationship: K is 3 letters before N (\( 11 - 14 = -3 \)). O is 3 letters before R (\( 15 - 18 = -3 \)).
    • This pair follows the pattern.
  • Option 4: JN - GK
    • Cluster 1 (JN): J is the 10th letter, N is the 14th. Difference: \( 14 - 10 = 4 \).
    • Cluster 2 (GK): G is the 7th letter, K is the 11th. Difference: \( 11 - 7 = 4 \).
    • Relationship: G is 3 letters before J (\( 7 - 10 = -3 \)). K is 3 letters before N (\( 11 - 14 = -3 \)).
    • This pair follows the pattern.

Conclusion: Odd Pair Out

Three options (EI - BF, NR - KO, JN - GK) exhibit a consistent pattern: the difference between the letters within each cluster is 4, and the difference between the first letters of the two clusters is -3, as is the difference between the second letters. The pair PT - MR does not conform to this pattern.

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Similar Questions

  1. 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 letter-cluster 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.)

  2. 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 letter-cluster pair DOES NOT belong to that group? 

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Important Questions from Classification

  1. Three of the following four 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.)

  2. Three of the following numbers are alike in a certain way and one is different. Pick the odd one out.

    (NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into their constituent digits. E.g. 13 – Operations on 13 such as adding/deleting/multiplying etc. to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed.)

  3. The following contains two pairs of words which are related to each other in a certain way. Three of the following four word-pairs are alike as these have the same relationship and thus form a group. Which word-pair does NOT belong to that group?
    (The words must be considered as meaningful English words and must not be grouped based on the number of letters/number of consonants/vowels in the word)

  4. Three of the following four options are alike in a certain way and thus form a group. Which is the one that does NOT belong to that group?

    (NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into their constituent digits. E.g., 13 – Operations on 13 such as adding/subtracting/multiplying etc. to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed.)

  5. The following contains two pairs of words which are related to each other in a certain way. Three of the following four word-pairs are alike as these have the same relationship and thus form a group. Which word-pair does NOT belong to that group?
    (The words must be considered as meaningful English words and must not be grouped based on the number of letters/number of consonants/vowels in the word)

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