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Question

In the following question, four letter-number pairs are given. The letter-number on the left side of (−) is related to the letter-number on the right side of (−) with some Logic/Rule/Relation. Three pairs are similar on the 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 number 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)

This question was previously asked in
SSC CHSL 2025 Tier 1 Question Paper (21-Nov-2025) (Shift 1)
The correct answer is

108CX − 216DB

Each pair has a number part and a two-letter part, so the rule must be checked separately on the numbers and on the letters.

The number rule: the right number is exactly double the left in every pair — \(108\times2=216\), \(132\times2=264\), \(244\times2=488\) and \(296\times2=592\). So the numbers are consistent across all four and cannot separate the odd one.

The letter rule must therefore be the deciding feature; read the shift on the first letter and on the second letter of each pair.

For DR→EU: D+1=E and R+3=U. For AH→BK: A+1=B and H+3=K. For PU→QX: P+1=Q and U+3=X. So three pairs follow first letter +1, second letter +3.

Now test the remaining pair CX→DB. The first letter is fine, C+1=D, but the second letter X should move +3 to A (X→Y→Z→A), whereas the pair shows B, which is a shift of +4.

So 108CX − 216DB is the only pair that breaks the +1, +3 letter rule that the other three share, even though its number doubling is correct.

Hence the odd one out is 108CX − 216DB.

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  2. Three of the following are from the same category and one is different. Choose the odd one out.

  3. In the set of four numbers given, select the odd one out.

  4. Three of the following words are alike in some manner and hence form a group. Which word 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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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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