# Investment Banking & Asset Management interview questions

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### 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?”

### Trader at Jane Street

Sep 4, 2011
 “Suppose you have n points on a circle distributed such that after connecting all of the points with chords, the number of regions in the circle is maximized. How many regions are there?”

### 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.”

### Candidates Day Interviews for Multiple Areas (X-Div/Back Office) at Goldman Sachs

Mar 18, 2009
 2 of 2 found helpful
 “You are in a room with 3 switches which correspond to 3 bulbs in another room and you don't know which switch corresponds to which bulb. You can only enter the room with the bulbs once. You can NOT...”

### Assistant Trader at Jane Street

Feb 27, 2011
 “you have five coins. One is double-headed. Pick one coin at random without looking and throw it 5 times. Suppose the outcome are five heads, what is the probability that the coin picked is the...”

### Trader at Jane Street

Mar 6, 2012
 “A has 5 fair coins and B has 4 fair coins. A wins only if he flips more heads than B does. Probability of A winning?”

Nov 24, 2013
 “Why”

### Assistant Trader at Jane Street

Nov 9, 2011
 “If you roll a fair coin 12 times what is the expected product of number of heads and number of tails? (No papers of course)”
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