Maht Session #2

This is a discussion on Maht Session #2 within the A Brief History of Cprogramming.com forums, part of the Community Boards category; You have just made 81 coins. But soon after you realize that you made a lighter coin. How can you ...

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    A Banana Yoshi's Avatar
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    Math Session #2

    You have just made 81 coins. But soon after you realize that you made a lighter coin. How can you find out the lighter coin using only a balance 4 times?
    Last edited by Yoshi; 11-07-2001 at 08:50 PM.
    Yoshi

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    Back! ^.^ *Michelle*'s Avatar
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    My brain is already about to burst with my programming hw....no.....don't torture me...
    Michelle (o^.^o)
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    A Banana Yoshi's Avatar
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    Guillotine in place. Ready to torture
    Yoshi

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    Back! ^.^ *Michelle*'s Avatar
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    Guillotines don't torture, they can't really...I mean, you won't feel anything after it comes crashing down...
    Michelle (o^.^o)
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    A Banana Yoshi's Avatar
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    Bring the Time Machine and bring you back into the "Reign of Terror"
    Yoshi

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    Ethereal Raccoon Procyon's Avatar
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    Weighing 1: divide the 81 coins into three stacks of 27 and weigh any two. If one stack is lighter than the other, eliminate all the coins but that stack. If they're the same, keep the stack you didn't weigh instead.

    Weighing 2: divide the 27 remaining coins into 3 groups of 9; repeat

    Weighing 3: divide the 9 remaining coins in to 3 groups of 3; repeat

    Weighing 4: weigh any 2 of the remaining coins. If one is lighter than the other, that's the defective coin. Othersie, the one you didn't weigh is the defect.

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    Back! ^.^ *Michelle*'s Avatar
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    NOOOO........

    *grabs for the door of the time machine*
    Michelle (o^.^o)
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    A Banana Yoshi's Avatar
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    Thumbs up

    Procyon got it


    The one that the Time Patrol have
    Yoshi

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    Linguistic Engineer... doubleanti's Avatar
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    oh geeze... good one... dorkus! should have used some strange arbitrary number like... 73 or something like that... so that we wouldn't be clued! gosh!
    hasafraggin shizigishin oppashigger...

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    Back! ^.^ *Michelle*'s Avatar
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    Time Patrol?
    Michelle (o^.^o)
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    A Banana Yoshi's Avatar
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    Time Patrol tutorial-

    The police with time machine that arrest trans-time (new word!) criminals.
    Yoshi

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    Back! ^.^ *Michelle*'s Avatar
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    Oook, time patrol.....

    Well, even if the number is 81, I still didn't get it, well, I guess I didn't bother to think...hehe...
    Michelle (o^.^o)
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    A Banana Yoshi's Avatar
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    Your brain short circuited?
    Lockdown!! (Starcraft term)
    Yoshi

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    Back! ^.^ *Michelle*'s Avatar
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    *blank stare*
    Michelle (o^.^o)
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    A Banana Yoshi's Avatar
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    Lockdown is now off.

    BTW: Have you seen his latest movie: The legend of the Sun King?
    Yoshi

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