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 3
The logic followed here is :
25 : 3
⇒ 3 + 2 = 5
⇒ 52 = 25
64 : 6
⇒ 6 + 2 = 8
⇒ 82 = 64
100 : 9
⇒ 9 + 2 = 11
⇒ 112 = 121 ≠ 100
81 : 7
⇒ 7 + 2 = 9
⇒ 92 = 81