Find the odd number-pair from the given alternatives :

Options

A. 41-72
B. `12-30`
C. 51-42
D. `11-20`

Answer

A

Explanation

Except 41 - 72, in all other number-pairs, the difference between the two numbers is a multiple of 3.
`30-12 = 18`,
`51-42 =9`,
`20-11 =9`
But
72-41=31