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A comment on Negative Base. Parent comment

Re:Negative Base by gkfasdfasdf on Thursday June 28, 2018 @11:12AM (#17417504)
I'm going to have to take this riddle bait. My solution:

Move 1: weigh 6 coins vs 6 coins. Isolate the heavier set for the next move. Move 2: weigh 3 coins vs 3 coins. Isolate the heavier set for the next move. Move 3: weigh any two of the 3 remaining coins. If one is heavier, that is the counterfeit. Otherwise (if coins are equal in weight) the remaining coin is counterfeit.

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Re:Negative Base by ythn on Thursday June 28, 2018 @11:18AM (#17417565)
You failed because:

> One is counterfeit and is either heavier or lighter

It turned out the counterfeit was lighter and you discarded it after the first weighing.

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Re:Negative Base by gkfasdfasdf on Thursday June 28, 2018 @12:41PM (#17418426)
Ahhhh... hmm. I thought it seemed too easy.
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