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In the following question, in each alternative a group of numbers is given. The numbers of each group are related to the numbers of the same group by some Logic/Rule/Relation. Select that group of numbers in which numbers are not related by that same Logic/Rule/Relation.

(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

(626, 582, 548)

Each option is a group of three whole numbers, so the relation to test is the internal step between consecutive numbers, kept on the whole numbers as the note requires.

For (208, 174, 140): \(208-174=34\) and \(174-140=34\), a constant difference of 34.

For (412, 378, 344): \(412-378=34\) and \(378-344=34\), again a constant 34.

For (534, 500, 466): \(534-500=34\) and \(500-466=34\), once more a constant 34.

So the shared rule is a fixed decreasing step of 34 between the three numbers of a group.

For (626, 582, 548): \(626-582=44\) but \(582-548=34\), so the two steps are unequal and the fixed step of 34 fails.

Only this group breaks the constant-difference rule that the others obey. Hence the group not related by the same rule is (626, 582, 548).

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Important Questions from Classification

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  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?

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  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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