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.

45 : 576

THE LOGIC;

1) 29 : 225,

\( {(29+1) \(\div \) 2}^{2 } \) = \( {15}^{2} \) = 225

2) 17 : 81,

\( {{(17+1) \(\div \) 2}}^{2 } \) = \( {9}^{2} \) = 81

3) 45 : 576,

\( {{(45+1) \(\div \) 2}}^{2 } \) = \( {(46\(\div \)2)}^{2} \) = 232 NOT 576

Thus, 45 : 576 is the odd one.