Hi! I am going to washington state in fall of 2012 which I am really excited about

I know recs never hurt but I was wondering how important they are at wsu. I know I can get some for a fair amount of the sororities at wsu but I am not sure if I will be able to get all 14 covered. I know plenty of people who were in sororties but the thing is a lot of them were in the same ones. So I guess all I am wondering is if to have a good chance at wsu do I need a rec to every single sorority?