In a certain code, '1234' is coded as '2143'. What is '5678' coded as?
Q1. In a certain code, '1234' is coded as '2143'. What is '5678' coded as?
Answer: 6587
Explanation: The first and second digits are swapped, and the third and fourth digits are swapped. So, '1234' becomes '2143', and '5678' becomes '6587' (or '5768').