25 - 21
61 - 12
44 - 31
34 - 30
Answer is Wrong!
Answer is Right!
The answer is C. 44 – 31.
In all other options, the difference between the two numbers is a multiple of 13.
A. 25 – 21 = 4
B. 61 – 12 = 49
D. 34 – 30 = 4
However, in C. 44 – 31 = 13, the difference is not a multiple of 13.