Question
Download Solution PDFThe 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.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe logic followed here is:
Logic: (First number ÷ 2) + 1 = Second number
Let's check each option as per the logic,
1) 20 ∶ 11 → (20 ÷ 2) + 1 = 10 + 1 = 11
2) 6 ∶ 4 → (6 ÷ 2) + 1 = 3 + 1 = 4
3) 15 ∶ 9 → (15 ÷ 2) + 1 = 7.5 + 1 = 8.5 ≠ 9
4) 12 ∶ 7 → (12 ÷ 2) + 1 = 6 + 1 = 7
Here, we can see that only Option 3 doesn't follow the logic.
Hence, the correct answer is "15 ∶ 9".
Last updated on Jul 19, 2025
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