The second number in the given number-pairs is obtained by performing certain mathematical operation(s) on the first number. The same operation(s) is/are followed in all the number-pairs except one. Find that odd number-pair.

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SSC CGL 2023 Tier-I Official Paper (Held On: 25 Jul 2023 Shift 2)
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  1. 2 : 9
  2. 6 : 21
  3. 10 : 33
  4. 8 : 29

Answer (Detailed Solution Below)

Option 4 : 8 : 29
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Detailed Solution

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Logic : (1st number × 3) + 3 = 2nd number

So, 

  • Option - (1) : 2 : 9

2 × 3 + 3 = 9

6 + 3 = 9

9 = 9 (LHS = RHS)

  • Option - (2) : 6 : 21

6 × 3 + 3 = 21

18 + 3 = 21

21 = 21 (LHS = RHS)

  • Option - (3) : 10 : 33  

10 × 3 + 3 = 33

30 + 3 = 33

33 = 33 (LHS = RHS)

  • Option - (4) : 8 : 29

8 × 3 + 3 = 29

24 + 3 = 29

27  29 (LHS ≠ RHS)

Hence, "Option - (4)" is the correct answer.

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