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    turk76's Avatar
    turk76 Posts: 3, Reputation: 1
    New Member
    		  
    #1

    Sep 15, 2012, 12:07 PM
    Riddle solver
    There are three boxes, a box containing two gold coins, a box with two silver coins and a box with one of each. After pulling out one gold coin from one of the boxes, that is % chance that the next coin from that same box will be gold
    odinn7's Avatar
    odinn7 Posts: 7,691, Reputation: 1547
    Entomology Expert
    		  
    #2

    Sep 15, 2012, 12:26 PM
    Sounds more like a homework question than a riddle.
    teacherjenn4's Avatar
    teacherjenn4 Posts: 4,005, Reputation: 468
    Education Expert
    		  
    #3

    Sep 15, 2012, 03:00 PM
    What did you get for the answer?
    turk76's Avatar
    turk76 Posts: 3, Reputation: 1
    New Member
    		  
    #4

    Sep 15, 2012, 03:03 PM
    I don't have one yet!
    teacherjenn4's Avatar
    teacherjenn4 Posts: 4,005, Reputation: 468
    Education Expert
    		  
    #5

    Sep 15, 2012, 03:04 PM
    You have to try or we can't help you. This is homework help, not get your homework done for you.
    turk76's Avatar
    turk76 Posts: 3, Reputation: 1
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    #6

    Sep 15, 2012, 03:09 PM
    It's been 30 years since I sat behind the desk, this is a question from a uni graduate so help us out
    teacherjenn4's Avatar
    teacherjenn4 Posts: 4,005, Reputation: 468
    Education Expert
    		  
    #7

    Sep 15, 2012, 05:18 PM
    After you pull out the one gold coin from one of your three boxes, what do you have left?
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #8

    Sep 16, 2012, 04:01 AM
    Think of it this way:

    |GG| |SS| |GS|

    3 boxes, G represents a gold coin and S represents a silver coin.

    Your first pick in that box was gold. So, it can only be the first or the second box.

    IF you have picked the first box, it would be another gold.
    IF you have picked the second box, it would be a silver.

    What is the probability that you picked the first box (that is, you will get another gold)?
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