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Monthly Archives for March, 2014

Liars, truth-tellers, mathematicians and physicists

Posted on: March 10th, 2014 by

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"

Guess a coin for freedom

Posted on: March 7th, 2014 by

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
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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
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You start with a shuffled deck of 52 cards numbered 1,2,3,...52. You place them in 4 rows and 13 columns. Then you sort each row in ascending order as per their number. Then you sort each column in ascending order. After this procedure, determine the maximum number of swaps needed to sort a particular row. - via Algorithmic puzzles

Squaring a triangle

Posted on: March 1st, 2014 by

A triangle is formed by arranging 1+3+5+7+...(2n-1) = n^2 coins as shown in the figure below. triangle_square What is the minimum number of coins that you need to move so that you can form a square that uses all the coins? - via Algorithmic puzzles

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