Permissions and access denied within groups

Hi,

This will hopefully be a simple question that can be answered easily.

UserA is in a group that denies access to a specified folder. However this UserA needs access to this Folder.

If I added him directly to the folder permissions as Read/Write.....Would he get access denied or would he have read write permissions? And why?

This is for server 2003 and 2008.

Thank you for your help.