mightaswell

Logic puzzles

Like puzzles? here's a good start :

3. The Fake Coin
You have twelve coins. You know that one is fake. The only thing that distinguishes the fake coin from the real coins is that its weight is imperceptibly different. You have a perfectly balanced scale. The scale only tells you which side weighs more than the other side.
What is the smallest number of times you must use the scale in order to always find the fake coin?
Use only the twelve coins themselves and no others, no other weights, no cutting coins, no pencil marks on the scale. etc.
These are modern coins, so the fake coin is not necessarily lighter.
Presume the worst case scenario, and don't hope that you will pick the right coin on the first attempt.

Here are a few more.

Some more general info about puzzles & their history:
Logic puzzle - Wikipedia, the free encyclopedia: "A logic puzzle is a puzzle deriving from the mathematics field of deduction. This branch was produced by Charles Lutwidge Dodgson, who is better known under his pseudonym Lewis Carroll, the author of Alice's Adventures in Wonderland. In his book The Game of Symbolic Logic he introduced a game to solve problems such as some games are fun every puzzle is a game Are all puzzles fun? Not Necessarily. "

Few more links here

posted by Amogh @ 1:48 AM