How do I go about this? I dont understand the process of how to solve this question...

Provide two different DIV and TOP register value combinations such that the pulse widths in the range of 42s to 84s, i.e. tH values from 42s to 84s, can be generated. Also make sure that these combinations can generate at least 100 different pulse width values in the required range. Finally, provide the valid range of CC register values for each combination.