## Liars, truth-tellers, mathematicians and physicists

Posted on: March 10th, 2014 by
6

There are N mathematicians and N physicists in a circular table. Some of them are liars and some are truth-tellers. The number of truth tellers who are mathematicians is equal to the number of truth teller a who are physicists. They are all asked, "Is the person next to you a mathematician or a physicist?" They all reply "physicist." Show that N must be even. - Continue reading the story "Liars, truth-tellers, mathematicians and physicists"

Posted on: March 7th, 2014 by
5

A and B are prisoners. The jailer have them play a game. He places one coin on each cell of an 8x8 chessboard. Some are tails up and others are heads up. B cannot yet see the board. The jailer shows the board to A and selects a cell. He will allow A to flip exactly one coin on the board. Then B arrives. He Continue reading the story "Guess a coin for freedom"

## Five in Seven

Posted on: March 5th, 2014 by
You have 5 items of different weights and a two-pan balance scale with no weights. How can you sort the items in ascending order in just seven weighings? - via Algorithmic puzzles

## Two dimensional sort

Posted on: March 3rd, 2014 by