<p>Even though Princeton’s Program in math is as good and probably harder than Harvard, it is true that most IMO medalist go to Harvard.
I only know of 3 freshmen at Princeton this year( I would guess there are around 6 freshmen). I am not sure about IPhO or USAMO, though.
As for the numbers: it is 6 per country per year. So, there are more than 6 IMO medalist out there…
@Princeton2014: I guess you are right, but I think some people are in the sequence for an easy A. In fact, the kid who is taking 3 maths got an A+ in 215.</p>