Four number-pairs have been given, out of which three are alike in some manner and one is different. Select the number-pair that is different from the rest.

57 - 38

THE LOGIC;

(Difference of squares of the digits of 1st number is equal to 2nd number)

So,

1) 42 - 12,

( \( {4 }^{ 2} \)-\( {2 }^{ 2} \) ) = 12

2) 57 - 38,

( \( {7 }^{ 2} \)-\( {5 }^{ 2} \) ) \(\neq \) 38

3) 28 - 60,

( \( {8 }^{ 2} \)-\( {2 }^{ 2} \) ) = 60

4) 39 - 72,

( \( {9 }^{ 2} \)-\( {3 }^{ 2} \) ) = 72

Thus, 57 - 38 is the odd one.