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 4
The logic followed here Is :
Add 1 in Ist number
Then square of that number and you will get the second number
option 1 3 : 16
3+1 = 4
42 = 16
option 2 6 : 49
6 + 1 = 7
72 = 49
option 3 12 : 169
12 +1 = 13
132 = 169
option 4 9 : 64
9 +1 = 10
102 = 100