Ellie Sleightholm on Instagram: "The hardest mathematics problem on the hardest exam? IMO 1988 Problem 6 has gone down in history as one of the most legendary Olympiad problems ever given, not just because it was hard, but because of what happened behind the scenes. When the problem was proposed, even the jury and problem committee struggled to solve it. Several members couldn’t crack it during the preparation meetings, and there was real debate about whether it was too difficult to include at a