Coin riddle?

4 times....

1) Weigh 12 and 12...one side will be heavier

2) Weigh 6 and 6 (of the heavier 12)...one side will be heavier

3) Weigh 3 and 3 (of the heavier 6)...one side will be heavier

4) Weigh 2 of the remaining 3 coins...if one side is heavier, that's your coin, if they are equal, the one you didn't weigh is the coin.

3 times

1. Weigh 8-8 see if they are equal or one is heavy. If both are equal select the third pile.

2. Weigh 3-3. If one is heavy select it. If both are equal the other pile with 2 coins is the one.

3. If it is a 3 coin pile weigh 1-1 select the heavier one. If both are equal the third one is the heavier one. If it is the 2 coin pile in step two, weigh them one on each side and select the heavier one.

You could do what dave said, or with a 1/4 chance of it taking 5 turns, and 3/4 chances of taking 4 or less, you could do it as follows... divide into 4 equal piles of 6 each, weigh half of each, if one side is heavier in a pile, do the rest as dave said.

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er, i-im not fairly farmiliar with english forex, yet i'd say a million pound peice, and twenty (cent?) piece, because in ordinary words definitely one of them isn't a .20 piece, didnt say some thing about the different. ;-) not person-friendly, you're.

I Agree with David

I accepted David's answer

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lol

have a nice day !