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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 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 NTPC 2025 Graduate Level CBT 1 Question Paper (25-Mar-2026) (Shift 3)
The correct answer is

CH – EK

To find the letter-cluster pair that does not belong to the group, we need to analyze each pair and determine the pattern that three pairs have in common.

  1. First, we write down the positions of the letters in the alphabet for each letter-cluster:
    1. CH – EK: C(3), H(8); E(5), K(11)
    2. DJ – GM: D(4), J(10); G(7), M(13)
    3. AF – DI: A(1), F(6); D(4), I(9)
    4. BG – EJ: B(2), G(7); E(5), J(10)
  2. Next, we calculate the position difference within each pair:
    1. CH – EK:
      • Difference between C and E: 5 - 3 = 2
      • Difference between H and K: 11 - 8 = 3
    2. DJ – GM:
      • Difference between D and G: 7 - 4 = 3
      • Difference between J and M: 13 - 10 = 3
    3. AF – DI:
      • Difference between A and D: 4 - 1 = 3
      • Difference between F and I: 9 - 6 = 3
    4. BG – EJ:
      • Difference between B and E: 5 - 2 = 3
      • Difference between G and J: 10 - 7 = 3
  3. Observation:
    1. The pairs DJ – GM, AF – DI, and BG – EJ have consistent differences of +3 in both positions, forming a pattern.
    2. The pair CH – EK has differences of +2 and +3, not following this consistent pattern of +3.

Therefore, the letter-cluster pair that does not belong to the group is CH – EK.

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

  3. 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.)


Important Questions from Classification

  1. In the following question, four number pairs are given. In each pair the number on left side of (-) is related to the number of the right side of (-) with some Logic/Rule/Relation. Three pairs are similar on basis of same Logic/Rule/Relation.
    Select the odd one out from the given alternatives. (NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into its 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)

  2. 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.)

  3. 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.)

  4. 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)

  5. 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.)

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