# Finance interview questions

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### Assistant Trader at Jane Street

Oct 10, 2011
 “Coin Triplets Problem Denote H for head, T for tail in a coin flip. Flip a fair coin many times until either a pattern of HHT or HTT occurs. What's the probability that HHT occurs before HTT...”

### Assistant Trader at Jane Street

Oct 13, 2011
 “What is the last digit in the solution to 3^33?”

### Financial Advisor Trainee at Merrill Lynch

Jun 10, 2010
 “If given X area square footage and X length of the room, what is the room's perimeter?”

### Assistant Trader at Susquehanna International Group, LLP

Apr 22, 2011
 “If there is an 84% chance of an event happening in an hour, what is the probability that it happens in half an hour?”

### Quantitative Trader at Jane Street

Jan 2, 2010
 “You flip four coins. At least two are tails. What is the probability that exactly three are tails? Do this in your head, you are not allowed to write anything down for this question.”

### Software Developer at D. E. Shaw & Co. - Investment Firm

Nov 3, 2010
 “You are in a room with 100 lights, initially all off. If you first toggle every light, then every second, and so forth up to 100, which lights will be on at the end?”

### Assistant Trader at Jane Street

Oct 15, 2010
 “Calculate e^5 up to two decimal numbers without calculation”

### Summer Analyst at Goldman Sachs

Mar 23, 2010
 “how many times the hour and minute hands of the clock form right angle during one day?”