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: C
Explanation
The correct answer is option 3 i.e. 100 : 9
The logic used here is:
25 : 3 :- (3 + 2)2 = 25
64 : 6 :- (6 + 2)2 = 64
81 : 7 :- (7 + 2)2 = 81
But, 100 : 9 :- (9 + 1)2 = 100
Out of the four options, option 3 is the odd one out.
Hence, option 3 is the correct option.