20 Oct '05 10:17

very old one....but one of my favs.

I have 9 coins. one of these is fake and weighs marginally lighter than the remaining 8. I have a weighing balance. What is the minimum number of times i need to use the balance to be able to unmistakably detect the fake coin?

I have 9 coins. one of these is fake and weighs marginally lighter than the remaining 8. I have a weighing balance. What is the minimum number of times i need to use the balance to be able to unmistakably detect the fake coin?