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.
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 21 : 431.
The logic in the given series is: In all the pairs, the second number is the square of the first.
152 : 225
132 : 169
122 : 144
Except for the first pair: 212 ≠ 431