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The 2012 Summer Olympics in London had a total of 10,820 athletes representing 204 nations.
Summer and Winter combine, 32 times after the London Olympics are over.
896 gymnasts participated in the 2008 Summer Olympics.
205205The are 204 NOC with athletes who participated in the 2012 Summer Olympics
London,England
Jamaica first participated in the Summer Olympics at the 1948 Games in London and in the Winter Olympics at the 1988 Games in Calgary.
Ethiopia first participated in the Summer Olympics in 1956 and has been to every Summer Olympics, except the 1976 Summer Olympics, since then.
It hasn't happened
2012 Summer Olympics will be held in London, England
Belgium has participated in both Olympics i got my answer from wikipedia
44 countries participated in the 1924 Summer Olympics. 16 countries participated in the 1924 Winter Olympics.
Jamaica first participated in the Summer Olympics in 1948 and has participated in every Summer Olympics since then.