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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

(72, 144, 190)

In each group compare the second and third numbers with the first; three groups share the same internal relation and one group breaks it.

The common rule is: second = first × 2 and third = first × 2.5.

(64, 128, 160): 64 × 2 = 128 and 64 × 2.5 = 160. ✓

(84, 168, 210): 84 × 2 = 168 and 84 × 2.5 = 210. ✓

(50, 100, 125): 50 × 2 = 100 and 50 × 2.5 = 125. ✓

(72, 144, 190): 72 × 2 = 144 is correct, but 72 × 2.5 = 180, not 190.

So the group (72, 144, 190) does not follow the first ×2, first ×2.5 pattern.

Hence the group whose numbers are not related by the common rule is (72, 144, 190).

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Important Questions from Classification

  1. Directions for the following 3 (three) items : consider the given information and answer the three items that follow. 

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    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 

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  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). 

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