Google Quantitative Analyst interview questions

First, a very helpful recruiter contacted me and asked a few questions about my experience. After a few days, she said I could proceed to the second stage: a technical phone interview. I was interviewed by a random engineer from a random department. He asked about my background, and let me solve a probability problem. The question itself was not too hard, but I didn't do it very well (because I hadn't used it for many years).

Hiring process was very smooth, took less than 2 weeks to go through 5 interviews: 1 phone call and 4 on site interviews. Got feedback the same day after all interviews and the offer in less than 2 weeks since the initial interview. Recruiter and interviews were very professional and the interviews were not particularly hard, not the the famous "how many golf balls fit in a bus" type of questions.