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.

9 : 355

THE LOGIC;

(Cube of 1st number \(\div \) 2) + 0.5 = 2nd number)

1) 3:14,

(\( {3}^{3} \) \(\div \) 2) +0.5

27 \(\div \) 2 +0.5

14

2) 5:63,

(\( {5}^{3} \) \(\div \) 2) +0.5

125 \) \(\div \ 2+0.5

63

3) 7:172,

(\( {7}^{3} \) \(\div \) 2) +0.5

343 \) \(\div \) 2+0.5

172

4) 9:355,

(\( {9}^{3} \) \(\div \) 2) +0.5

364.5+0.5

365 not 355

Thus, 9:355 is the odd one.