Correct Answer - Option 4 : 19 : 246
The logic follows here is:
The 2nd number is completely divisible by 1st number.
Option 1 → 17 : 221
221 is completely divisible by 17.
Option 2 → 13 : 143
143 is divisible by 13.
Option 3 → 12 : 156
156 is divisible by 12.
Option 4 → 19 : 246
246 is not divisible by 19.
In all the pairs except (4), the second number is divisible by the second.
Hence, "19 : 246" is the correct answer.
