Category Archives: puzzles

Puzzle – Clock

Posted on June 14, 2008 by nolfonzo

It’s 3 O’Clock. What will be the time when the minute and hour hands are next in the same position (coincident)? One way to solve this problem:  start with the minute hand at the 12 and hour hand at the … Continue reading →

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More puzzles…

Posted on June 14, 2008 by nolfonzo

Some of these are from Heard on the Street – a book of interview questions for Quants I’m trying to get through. Well worth a read if you’re into this sort of thing… 1. Two ropes of different lengths, and … Continue reading →

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Puzzle – Alternating coin toss game

Posted on June 5, 2008 by nolfonzo

A really simple problem, but needs a trick or two to solve quickly. Question: You take it in turns tossing a coin with a friend – you having the first toss – and keep going until one of you tosses … Continue reading →

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Classic Probability Puzzles

Posted on June 1, 2008 by nolfonzo

1. I have two children. One of my children is a girl. What are the chances I have two girls? The answer to this question is not 50/50. After being told that one of your children is a girl, you … Continue reading →

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