205
As of July 6 2012 there are 200 countries with at least 1 qualified athlete
205
there are 30 athletes competing in the London 2012 games.
none
In London Olympics 2012 from Romania were 104 athletes.
205
there are 204 nations competing in this olympics
There will be 75 athletes competing for Jamaicia
Wikipedia lists Germany as having 391 athletes competing in the 2012 Summer Olympics in London
250
7