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: 17 Jul 2023 Shift 1)
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  1. 12 ∶ 47 ∶ 60   
  2. 4 ∶ 16 ∶ 20 
  3. 2 ∶ 7 ∶ 10 
  4. 5 ∶ 19 ∶ 25  

Answer (Detailed Solution Below)

Option 2 : 4 ∶ 16 ∶ 20 
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Detailed Solution

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The logic followed here is:

Logic: (First number + Second number) + 1 = Third number

  • 1. 12 ∶ 47 ∶ 60 → (12 + 47) + 1 = 59 + 1 = 60
  • 2. ∶ 16 ∶ 20 → (4 + 16) + 1 = 21 + 1 = 21 ≠ 20
  • 3. ∶ ∶ 10 → (2 + 7) + 1 = 9 + 1 = 10
  • 4. ∶ 19 ∶ 25 → (5 + 19) + 1 = 24 + 1 = 25

Hence, '∶ 16 ∶ 20' is the correct answer.

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