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 3
The logic followed here Is :
(Ist number)2 - 1 = second number
4 : 15 = 42 - 1 = 15
12 : 143 = 122 - 1 = 143
8 : 66 = 82 - 1 = 63 ≠ 66
3 : 8 = 32 - 1 = 8