The second number in the given number pairs is obtained by performing certain mathematical operations(s) on the first number. The same operation(s) are followed in all the number pairs except one. Find that odd number pair.
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 2 : 10.
Logic: 1st number × (1st number + 4) = 2nd number
5 : 45 → 5 × (5 + 4) = 45
2 : 10 → 2 × (2 + 4) = 12 ≠ 10
3 : 21 → 3 × (3 + 4) = 21
4 : 32 → 4 × (4 + 4) = 32
Thus, "2 : 10" is odd number pair.