Alphanumeric Sequences Questions typically present you six to eight alphanumeric strings and provide you the first two to three steps to let you work out the rest. In this kind of questions you will need to observe all strings, especially the first three to four, to find out the rules such as order of letters, increase/decrease of numbers as well as position changes. Here is an example:
We could notice both letters are moving to respective next letters with the position being swapped. So the right order is: CF-GD-EH-IF-GJ-KH-IL