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Puzzle solution: Xen voting algorithm

I think that the problem stated in one of my earlier posts is one of the most fascinating puzzles I came across recently. Many people that got confronted with it said bluntly that the problem simply has no solution, otherwise it would contradict common Read More...
Posted Monday, November 26, 2007 1:19 PM by AdiOltean | 3 Comments
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Two math puzzles

What is the value of this expression? If that was too easy, how about this one? Read More...
Posted Monday, September 12, 2005 3:10 PM by AdiOltean | 21 Comments
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Puzzle: do you know chemistry?

Here is a very nice puzzle - But unfortunately you have to ressurect a little chemistry knowledge to fully appreciate it... You have two identical test tubes. Both tubes look identical - they both contain colourless, odoreless, aqueous solutions. But Read More...
Posted Thursday, April 21, 2005 11:36 PM by AdiOltean | 10 Comments

Puzzle: geometry problem

Here is a fun one: The triangle ABC is isoseceles, with angle (ABC) = angle (ACB) = 80°. We draw now two segments inside the triangle. First, we choose the point D on segment AC such that angle (CBD) is 60°. Also, we choose the point E on AB, where angle Read More...
Posted Monday, April 11, 2005 7:52 PM by AdiOltean | 18 Comments
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Little math problem

OK, probably you already had your latte this morning but here is nice puzzle: Let's say that a rectangle is "rational" if the ratio between the width and height is a rational number. Now, proof that a rectangle is rational if and only if the rectangle Read More...
Posted Friday, November 12, 2004 2:54 PM by AdiOltean | 14 Comments
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Ponder this

I just discovered this site . It contains all sorts of math/cs/algorithm-related problems. Some of them are beautiful, others so-and-so... But at least in my case, the effects can be already seen - red eyes :-) Here is an really nice challenge: Ponder Read More...
Posted Wednesday, May 05, 2004 3:54 AM by AdiOltean | 3 Comments
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