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Originally Posted by rudedog
OK,
here goes
you have a total of 9 coins, you break them up into 3 groups of 3. you take 2 groups and weigh them against each other.
You have 2 possible solutions, they are equal or one is lighter then the other
If they are are equal then you take the last group and weigh 1 coin against 1 coin. if they are equal , your last remaining coin is the lightest.
or you will have a one coin lighter then the other
If one is lighter, you take that group and weigh 1 coin against 1 coin. if they are equal , your last remaining coin is the lightest.
or you will have a one coin lighter then the other
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That's EXACTLY right, rudedog! I would mail you a cookie, but it would probably go stale before it got to your house.