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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

SO - RV

Alphabetical Order Reasoning

This question requires us to identify which pair of letter clusters is different from the others based on a specific relationship derived from the English alphabetical order. We need to figure out the pattern connecting the letters within the pairs and find the one that doesn't fit.

Analyzing Letter Cluster Relationships

The key is to look at the positions of the letters in the alphabet (A=1, B=2, ..., Z=26). The question notes that the number of vowels/consonants or their positions isn't the deciding factor, so we focus on the numerical gap or difference between letter positions.

Step 1: Calculate Positional Differences for Each Pair

Let's analyze each pair by finding the difference between the alphabetical positions of the letters:

  • PL - OR:

    In 'PL', P is the \(16^{th}\) letter and L is the \(12^{th}\) letter. The absolute difference is \(|16 - 12| = 4\).

    In 'OR', O is the \(15^{th}\) letter and R is the \(18^{th}\) letter. The absolute difference is \(|18 - 15| = 3\).

    This pair follows the pattern of differences (4, 3).

  • SO - RV:

    In 'SO', S is the \(19^{th}\) letter and O is the \(15^{th}\) letter. The absolute difference is \(|19 - 15| = 4\).

    In 'RV', R is the \(18^{th}\) letter and V is the \(22^{nd}\) letter. The absolute difference is \(|22 - 18| = 4\).

    This pair follows the pattern of differences (4, 4).

  • NJ - MP:

    In 'NJ', N is the \(14^{th}\) letter and J is the \(10^{th}\) letter. The absolute difference is \(|14 - 10| = 4\).

    In 'MP', M is the \(13^{th}\) letter and P is the \(16^{th}\) letter. The absolute difference is \(|16 - 13| = 3\).

    This pair follows the pattern of differences (4, 3).

  • LH - KN:

    In 'LH', L is the \(12^{th}\) letter and H is the \(8^{th}\) letter. The absolute difference is \(|12 - 8| = 4\).

    In 'KN', K is the \(11^{th}\) letter and N is the \(14^{th}\) letter. The absolute difference is \(|14 - 11| = 3\).

    This pair follows the pattern of differences (4, 3).

Step 2: Tabulate the Findings

Comparing the difference patterns helps us see the commonality and the outlier:

Pair Letters & Positions Difference in 1st Cluster Difference in 2nd Cluster Pattern (Diff1, Diff2)
PL - OR P(\(16^{th}\)), L(\(12^{th}\))
O(\(15^{th}\)), R(\(18^{th}\))
\(|16 - 12| = 4\) \(|18 - 15| = 3\) (4, 3)
SO - RV S(\(19^{th}\)), O(\(15^{th}\))
R(\(18^{th}\)), V(\(22^{nd}\))
\(|19 - 15| = 4\) \(|22 - 18| = 4\) (4, 4)
NJ - MP N(\(14^{th}\)), J(\(10^{th}\))
M(\(13^{th}\)), P(\(16^{th}\))
\(|14 - 10| = 4\) \(|16 - 13| = 3\) (4, 3)
LH - KN L(\(12^{th}\)), H(\(8^{th}\))
K(\(11^{th}\)), N(\(14^{th}\))
\(|12 - 8| = 4\) \(|14 - 11| = 3\) (4, 3)

Identifying the Odd Pair

Observing the patterns recorded in the table:

  • The pairs PL - OR, NJ - MP, and LH - KN all share the difference pattern (4, 3).
  • The pair SO - RV stands out with the difference pattern (4, 4).

Therefore, the pair SO - RV is the odd one out because it does not follow the (4, 3) difference pattern common to the other pairs.

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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 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 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 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.)

  4. Based on the English alphabetical order, three of the following four letter-clusters are alike in a certain way and thus form a group. Which letter-cluster 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.)

  5. 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.)

  6. Based on the English alphabetical order, three of the following four letter-clusters are alike in a certain way and thus form a group. Which letter-cluster 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.)

  7. 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.)

  8. 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.)

  9. 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.)
  10. Based on the English alphabetical order, three of the following four letter-clusters are alike in a certain way and thus form a group. Which letter-cluster 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. Directions for the following 3 (three) items : consider the given information and answer the three items that follow. 

    A, B, C, D, E, F and G are Lecturers from different cities—Hyderabad, Delhi, Shillong, Kanpur, Chennai, Mumbai and Srinagar (not necessarily in the same order) who participated in a conference. Each one of them is specialized in a different subject, viz., Economics, Commerce, History, Sociology, Geography, Mathematics and Statistics (not necessarily in the same order). 

    Further 1. Lecturer from Kanpur is specialized in Geography 

    2. Lecturer D is from Shillong 

    3. Lecturer C from Delhi is specialized in Sociology 

    4. Lecturer B is specialized in neither History nor Mathematics 

    5. Lecturer A who is specialized in Economics does not belong to Hyderabad 

    6. Lecturer F who is specialized in Commerce belongs to Srinagar 

    7. Lecturer G who is specialized in Statistics belongs to Chennai 

    Who is specialized in Geography?

  2. A, B, C, D, E, F and G are Lecturers from different cities—Hyderabad, Delhi, Shillong, Kanpur, Chennai, Mumbai and Srinagar (not necessarily in the same order) who participated in a conference. Each one of them is specialized in a different subject, viz., Economics, Commerce, History, Sociology, Geography, Mathematics and Statistics (not necessarily in the same order). 

    Further 1. Lecturer from Kanpur is specialized in Geography 

    2. Lecturer D is from Shillong 

    3. Lecturer C from Delhi is specialized in Sociology 

    4. Lecturer B is specialized in neither History nor Mathematics 

    5. Lecturer A who is specialized in Economics does not belong to Hyderabad 

    6. Lecturer F who is specialized in Commerce belongs to Srinagar 

    7. Lecturer G who is specialized in Statistics belongs to Chennai 

    To which city does the Lecturer specialized in Economics belong?

  3. A, B, C, D, E, F and G are Lecturers from different cities—Hyderabad, Delhi, Shillong, Kanpur, Chennai, Mumbai and Srinagar (not necessarily in the same order) who participated in a conference. Each one of them is specialized in a different subject, viz., Economics, Commerce, History, Sociology, Geography, Mathematics and Statistics (not necessarily in the same order). 

    Further 1. Lecturer from Kanpur is specialized in Geography 

    2. Lecturer D is from Shillong 

    3. Lecturer C from Delhi is specialized in Sociology 

    4. Lecturer B is specialized in neither History nor Mathematics 

    5. Lecturer A who is specialized in Economics does not belong to Hyderabad 

    6. Lecturer F who is specialized in Commerce belongs to Srinagar 

    7. Lecturer G who is specialized in Statistics belongs to Chennai 

    Who of the following belongs to Hyderabad?

  4. In a school, there are five teachers A, B, C, D and E. A and B teach Hindi and English. C and B teach English and Geography. D and A teach Mathematics and Hindi. E and B teach History and French. Who teaches maximum numb, of subjects?

  5. How many triangles are there in the given figure?

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