Four pairs of numbers have been given, out of which three are alike in some manner, while one is different. Choose out the odd one.
Answer & explanation
Correct answer: option 4
option 1 20, 42 = both are even numbers
option 2 132, 182 = both are even numbers
option 3 42, 72 = both are even numbers
option 4 56, 63 = both are odd numbers