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Math Help - Probability Sugar sugar

  1. #1
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    Probability Sugar sugar

    I am participating (in Europe) in a game where one question is concerning mathematics.
    Unfortunately, I am very weak in that domain and I am posting here the problem hoping some member “ll help me.

    Note for the webmaster : it is authorized in the regalement of the game to ask anyone for resolving the riddles.

    Every morning I put 7,5 (seven and a half) sugars in my coffee.

    In my kitchen I have 666 boxes of sugar numbered 1 to 666.

    Every morning I roll a dice which has 666 sides also numbered 1 to 666.

    For taking the sugars, I take them from the box with the number indicated by the dice.
    - if that box contains only entire sugars (not cut), I take 7 entire and I cut one into 2 pieces
    - If that box contains already an half sugar, I take it + 7 entire
    After having taken my 7,5 sugars, I refill the box with entire sugars. If there is already an half sugar in the box, I fill with 8 sugars and I put the half one on the box.

    Example:
    On the first day, let’s suppose a box containing 1000 entire sugars and let’s suppose that the dice shows the number of the box:
    I take 7 entire sugars, I cut 1 in 2 pieces and I take 1 of them. I place the remaining one on the top of the box.
    I have a box containing 992 entire sugars and a half one on the top.
    I refill the box with 8 entire sugars and I have a box containing 1000 entire sugar + ½ on the top of the box.

    Next time that I “ll visit the box (i.e. next time the dice with 666 sides shall indicate the number of that box) I take the ½ sugar on the top and 7 entire inside.
    I have a box containing 993 entire sugars,
    I refill the box with 7 entire sugars and I have a box containing 1000 entire sugar like the first day.

    A.S.O.

    We can conclude that

    - At the end of the first day, there is on a box in my kitchen ½ sugar. This is for sure!
    - At the end of the second day, we can have till 2 half sugar ( but we can also have 0 if the dice indicates again the same number of box !)
    - At the end of the third day, we can have till 3 half sugar. ( but we can also have 0, 1 or 3)
    - A.S.O.

    The question is:
    What is the probability for having in my kitchen EXACTLY 333 half sugar after 123 456 789 days?

    Thank you for your help.

    Kaji

    N.B. I beg your pardon for the mistakes in English but it’s not my mother language.
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  2. #2
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    Mar 2008
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    Quote Originally Posted by kaji View Post
    - At the end of the first day, there is on a box in my kitchen ½ sugar. This is for sure!
    - At the end of the second day, we can have till 2 half sugar ( but we can also have 0 if the dice indicates again the same number of box !)
    - At the end of the third day, we can have till 3 half sugar. ( but we can also have 0, 1 or 3)
    This sum is way too difficult for my poor brain at the moment - but at the end of the third day, you can't have 0 cubes, can you?

    And that is waaay too much sugar - very bad for your teeth.
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  3. #3
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    Thumbs up yes you are right!

    At the end of the 3rd day ( like for all odd day number) you are right! You cannot have 0 or even number of half sugars.

    Thanks for that correction.

    Kaji
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