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.
Explanation:
The relation between first and second number is
(n + 3)2 : n
∴ Option (a) is the odd one out as it is (n - 2)2 : n
Hence, option (a).