The second number in the given number-pairs is obtained by performing certain mathematical operation(s) on the first number. The same operation(s) are followed in all the number-pairs EXCEPT one. Find that odd number-pair.
Answer & explanation
Correct answer: option 4
option 1 81 :12
92 = 81
9 + 3 = 12
option 2 64 : 11
82 = 64
8 + 3 = 11
option 3 100 :13
102 = 100
10 + 3 = 13
option 4 121 : 16
112 = 121
11+ 3 = 14 but 16 is given (odd)