Correct Answer: 42 – 29

Solution : Let's check the options –
First option: 73 – 61 → 73 – 61 = 12
Second option: 57 – 69 → 69 – 57 = 12
Third option: 47 – 59 → 59 – 47 = 12
Fourth option: 42 – 29 → 42 – 29 = 13 ≠ 12

So, the fourth option differs from the other three options as the difference between the numbers is 13 instead of 12. Hence, the fourth option is correct.