Trading Intern

Supposedly there are 4-5 rounds of interviews; all of them but the last via phone, progressively harder, while the last one is an on-site interview. The first round consisted only of mathematical questions, starting with mental math, ending with basic probability. There were 10-15 questions (depends how you number them), and level of confidence for every answer was also asked. The interview lasted around 20 minutes. The second round had 4 questions, 3 probability and 1 estimation. They still wanted confidence levels for every question, and they were willing to bet on every answer (you start with 1000000 virtual $). The interview lasted 60 minutes. Two days later, they informed me that I wasn't invited to the next round.