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.
Answer & explanation
Correct answer: option 2
The logic followed here is :
IInd number2 - 1 = Ist number
48:7 → 72 - 1 = 48
25:8 → 82 - 1 = 63 (odd)
15:4 → 42 - 1 = 15
8:3 → 32 - 1 = 8