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.
Answer & explanation
Correct answer: option 2
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.