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Category Archives: puzzles
Puzzle – Clock
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
More puzzles…
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
Puzzle – Alternating coin toss game
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
Classic Probability Puzzles
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