Four boys play on a merry-go-round at a park .
There is a very good chance that some boys are playing dangerously on a merry-go-round .
There is almost no chance that some boys are playing dangerously on a merry-go-round .
There is a very good chance that some boys are playing dangerously on a merry-go-round .
Some boys are playing dangerously on a merry-go-round .