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Goldman Sachs Summer Internship - Quantitative Investment Strategies Interview Question (student candidate)

I interviewed in New York, NY and was asked:
"Suppose that you have a fair coin. You start with $0. You win 1$ each time you get a head and loose $1 each time you get tails. Calculate the probability of getting $2 without getting below $0 at any time."
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Draw a tree to have an idea of how to compute the probability. The flips are all independent with each other.
- Interview Candidate on Apr 10, 2012 Flag Response
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- Vipin Agrawal on Sep 2, 2013 Flag Response

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