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 - 1)2 = second number
12 : 121 = 12 - 1 = (11)2 = 121
6 : 25 = 6 - 1 = (5)2 = 25
9 : 100 = 9 - 1 = (8)2 = 64 ≠ 100
8 : 49 = 8 - 1 = (7)2 = 49