Monthly Archives: August 2007

Weekend Hiatus

Dear visitors, due to the passing this past Wednesday of my last grandparent (at age 85), I probably won’t be able to update this blog as I travel out-of-town to the funeral and related family events. To my U.S.-based visitors, … Continue reading

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Interview Question: Spread Thy Options

Sample Question #124 (finance – option trading) There’re three parts to this question. 1) What’s the difference between a straddle and a strangle? 2) Draw the profit pattern (i.e., payoff chart) of a straddle. 3) Draw the profit pattern (i.e., … Continue reading

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Interview Question: Subtle Problem

Sample Question #123 (programming – R) What’s wrong with the following R code segment? Here "mm" is an N x K dataset that’s already read into memory and "prc" is one of the variables in "mm". ss=mm[2:59,]av=mean(ss$prc)if (av >= 50) { pg … Continue reading

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Interview Question: Exponential Expectation

Sample Question #122 (probability theory) If X ~ N(0, σ2), what’s E(eX)? Hint: there’s a name for E(eX). [Question courtesy of Dr. Yun Cheng of ITG]

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Interview Question: Clock Hands

Sample Question #121 (brainteaser) How many times do the hour and minute hands of a clock overlap during the 24-hour day? Let’s assume the day runs from 12 midnight to 12 midnight.

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Interview Question: Push to the Limit

Sample Question #120 (mathematics) What is the limit of sqrt(x2+x) – x as x goes to infinity (Comment: limit questions are popular at quant interviews)

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Interview Question: Traveling Puzzle

Sample Question #119 (brain teaser) A man is traveling from city A to city B. On the first day, he travels half the distance. On the second day, he travels 1/3 of the remaining distance. On the third day, he … Continue reading

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