The first round OA was 30 minutes with 18 probability questions. The time wasn't tight — most of them were easy-to-medium difficulty questions from the green book, or similar ones. I still remember the last question: from the 30 numbers 1 to 30, you draw three numbers without replacement — what's the probability that the three numbers form an arithmetic sequence? I think I'd seen a similar question before, from a SIG phone interview.
The second round OA was mental math and number-sequence pattern recognition. The sequence questions were easy — the patterns were mostly arithmetic, higher-order arithmetic, geometric, and other common patterns, and there was plenty of time. The mental math section was a bit more time-pressured — I remember it being something like 50 questions in 5 minutes, all multiple choice. The OA's UI was weird and not very user-friendly — clicking through the answer options took extra time.
The third round OA was a cognitive test — little games that test your reaction speed, quickness, and attention. It's hard to prepare for; if you're used to playing games regularly you'd probably adapt to it more easily.
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