Three of the following four triads are alike in a certain way as they are formed by performing same mathematical operations among themselves and thus form a group. Which triad does NOT belong to that group? 

This question was previously asked in
SSC CGL 2023 Tier-I Official Paper (Held On: 14 Jul 2023 Shift 2)
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  1. 36 13 7  
  2. 16 9 5
  3. 72 16 8
  4. 1 3 2

Answer (Detailed Solution Below)

Option 3 : 72 16 8
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PYST 1: SSC CGL - General Awareness (Held On : 20 April 2022 Shift 2)
25 Qs. 50 Marks 10 Mins

Detailed Solution

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The logic followed here is:

Logic: (Second number - Third number)2 = First number

  1. 36 ∶ 13 ∶ 7 → (13 - 7)2 = 62 = 36
  2. 16 ∶ 9 ∶ 5 → (9 - 5)2 = 42 = 16
  3. 72 ∶ 16 ∶ 8 → (16 - 8)2 = 82 = 64 ≠ 72
  4. 1 ∶ 3 ∶ 2 → (3 - 2)2 = 12 = 1

Hence, '72 ∶ 16 ∶ 8' is the correct answer.

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