How do I hide worksheets based on combo box selection?

I have a workbook with 42 worksheets. Worksheets 6-35 to be hidden. They are grouped in 3's. So the first group of three sheets will be named "1 - XXXXX". The second group will be "2 - XXXXX".

On the first worksheet in the book, users are asked to select a number from a combo box (1-10). If the user selects "1", sheets 6-8 should unhide. If the user selects "2", sheets 6-11 should unhide. If the user selects "3", sheets 6-14 should unhide. etc..

Also, If the user has selected "7", for example, and changes the number to "3", the respective sheets should be re-hidden.

Thanks in advance for any help.