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.

16 : 8 4 : 5 9 : 6 36 : 9

16 : 8

THE LOGIC; 1) 16 : 8, 4x4 : 4+3 16: 7 not 8 2) 4 : 5, 2x2 : 2+3 4 : 5 3) 9 : 6, 3x3 : 3+3 9 : 6 4) 36 : 9, 6x6 : 6+3 36 : 9 Thus, 16 : 8 is the odd one.