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Monthly Archives for December, 2013



The H factor

Posted on: December 10th, 2013 by
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A man in a bar asks the bartender for a glass of water. Instead the bartender pulls a gun from below the table and points it at the man. The man thanks the bartender and leaves the bar. What happened? (Give the most logical explanation as to why this behavior makes sense). - via Subhashini

A game of chicken - Correlated equilibrium

Posted on: December 9th, 2013 by
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Two teenage boys play the following game: They are in 2 different cars, and they are about to make a head on collision. The only way they survive is if one of them swerves in his lane and avoids the head-on collision. However, if one of them swerves and the other person goes straight, the boy who goes straight shouts "chicken" at the boy who Continue reading the story "A game of chicken - Correlated equilibrium"

Take coin from bottle

Posted on: December 8th, 2013 by
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A coin is dropped in a bottle, and then the bottle is sealed with a cork. How will you get the coin out without removing the cork or breaking the bottle? - via Good riddles now

A cup on a disk

Posted on: December 7th, 2013 by
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A cup partially filled with water is placed on a circular table and the table is rotated about it's axis at a constant speed. If the speed is too high, one of the following will happen: 1) The cup slides off the table. 2) The cup tips and falls. 3) The water in the cup splashes out. Of course, the speed of rotation, the size and shape of the Continue reading the story "A cup on a disk"

A puzzle

Posted on: December 6th, 2013 by
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Suppose f(x,y) is a continuous function such that f(x,y)=f(y,x) and \int_a^x f(u,y)du = \int_a^y f(x,u) du for all a,x,y \in \mathrm{R}. Show that f(x,y)=0 for all (x,y). - via Jiang Tao.

Six cylinders

Posted on: December 5th, 2013 by
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Arrange six identical solid cylinders in 3-D space such that every cylinder touches every other cylinder. - via Cheuk Ting Li

Will Google hire you?

Posted on: December 4th, 2013 by
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Find out by taking this quiz. Note: Google has changed its hiring procedures, so the above quiz is only for people who love puzzles.

A court case

Posted on: December 3rd, 2013 by
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Here is a tricky probability puzzle. A crime has been committed. A suspect has a blood type that matches the blood in the crime scene. The probability that an innocent person's blood matches the blood at the crime scene is 1/1000. What is the probability that the suspect is innocent? It's tricky to answer because I haven't specified all the variables needed to solve this puzzle. - Continue reading the story "A court case"

Skyscraper puzzle - medium

Posted on: December 2nd, 2013 by
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Consider the grid below. - You have to complete the grid such that every row and column contains the numbers 1 to 5. - Each row and column contains each number only once. - However, you have to follow the rules around the outside, which tell you how many skyscrapers you can see. - You can't see a shorter skyscraper behind a taller one. - The puzzles can be quite Continue reading the story "Skyscraper puzzle - medium"

Humans and Monkeys

Posted on: December 1st, 2013 by
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3 men, a big monkey and 2 small monkeys want to cross the river. They have a 2-seater boat (only 2 people at a time). Only a human or the big monkey can row the boat. At all times, the number of humans on either side of the river must be greater than or equal to the number of monkeys, otherwise humans will be eaten Continue reading the story "Humans and Monkeys"

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