# Quantitative Developer Interview Questions

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### Quantitative Developer at Bank of America

Jul 31, 2009
 “How to measure 9 minutes using only a 4 minute and 7 minute hourglass”

### Quantitative Developer at Bank of America

Jul 31, 2009
 “How many numbers between 1 and 1000 contain a 3?”

### Quantitative Developer at J.P. Morgan

Apr 30, 2012
 “You have a chest of 8 drawers. With probability 1/2, you put a letter in one of the drawers. With probability 1/2, you don't put a letter in any drawer. I open the first 7 drawers, all are empty…”

### Quantitative Developer at Bloomberg L.P.

Apr 12, 2011
 “How to compute square root of integer with only add, sub, div and mult”

### Quantitative Developer at Tower Research Capital LLC

Oct 15, 2010
 “If you toss a coin n times, what's the expected value of n if you get the 2nd head?”

### Quantitative Analyst/Developer at Allston Trading

Dec 4, 2010
 “Given a m*n matrix with values -1 or 1, try to flip the values in a given row and a given line efficiently.”

### Quantitative Developer at Goldman Sachs

Jun 8, 2010
 “There are 50 noddles in a bowl. Each time you randomly select two ends of the noddles from the bowl and tie together. What is the expected number of loops formed from this process?”

### Quantitative Developer at Bloomberg L.P.

Apr 12, 2011
 “Linear regression in discreet space such as color.”

### Quantitative Developer at Bloomberg L.P.

Mar 17, 2010
 “Implementing the LRU algo”

### Quantitative Developer at J.P. Morgan

Apr 30, 2012
 “Are you familiar with the Singleton or Factory pattern?”
110 of 28 Interview Questions