Friday, July 22, 2011

Counterfeit-coin puzzle

From Futility Closet: “You have nine coins and a balance scale. One of the coins is lighter than the others. Is it possible to identify it in only two weighings?”

(via Boing Boing)

comments: 1

Whit said...

This could have a Columbo image also. I wrote earlier and didn't leave my name