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Thread: Nine Gold Coins

  1. #1
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    Bob has nine gold coins, however one of the nine gold coins is fake. The fake gold coin is lighter than the real gold coin. He also has a scale (the old kind). Is it possible for Bob to figure out which gold coin is fake with just 2 measurements? If so, how? Good Luck!!


    <span style='font-family:Geneva'><span style='font-size:8pt;line-height:100%'><span style='color:red'> &quot;Its all fun and games till someone looses an eye......THEN its a sport&#33;&#33;&quot;
    - danyj</span></span></span>

  2. Lounge   -   #2
    100%'s Avatar ╚════╩═╬════╝
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    Counterfeiting is Illegal

    :rtfaq:

  3. Lounge   -   #3
    1. Two sets of three
    If they balance*, then

    2. one of the other three on each side.
    if the dont balance then you know the answer.
    If they do balance then the one left is the lighter.

    * If they dont balance then one of the lighter one on each side.
    if the dont balance then you know the answer.
    If they do balance then the one left is the lighter.


    Incidentally my name is bob.

    ******

    Now try the same thing with 12 coins, only this time you have three shots. but you dont know whether the coins is lighter or heavier. Good luck.
    <span style='color:blue'><span style='font-size:14pt;line-height:100%'>If you are not easily embarrassed
    Then make your move</span></span>

  4. Lounge   -   #4
    DanB's Avatar Smoke weed everyday
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    I got so confused between if they do and if they don&#39;t that I can&#39;t tell if you are right

  5. Lounge   -   #5
    Originally posted by danb@24 April 2004 - 19:47
    I got so confused between if they do and if they don&#39;t that I can&#39;t tell if you are right
    There is a formula Dan. But I have forgot it.
    <span style='color:blue'><span style='font-size:14pt;line-height:100%'>If you are not easily embarrassed
    Then make your move</span></span>

  6. Lounge   -   #6
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    1. Two sets of three
    If they balance*, then

    2. one of the other three on each side.
    if the dont balance then you know the answer.
    If they do balance then the one left is the lighter.

    * If they dont balance then one of the lighter one on each side.
    if the dont balance then you know the answer.
    If they do balance then the one left is the lighter.


    Incidentally my name is bob.&nbsp; &nbsp;

    ******

    Now try the same thing with 12 coins, only this time you have three shots. but you dont know whether the coins is lighter or heavier. Good luck.
    WRONG&#33;&#33;&#33;&#33;&#33;
























    i mean yes you are correct


    <span style='font-family:Geneva'><span style='font-size:8pt;line-height:100%'><span style='color:red'> &quot;Its all fun and games till someone looses an eye......THEN its a sport&#33;&#33;&quot;
    - danyj</span></span></span>

  7. Lounge   -   #7
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    spend them all. no more fake coin

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