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 A Bag of Fake Coins (Posted on 2003-07-25)
You have N large bags of coins. All of the bags contain real 12 gram coins except for one, that one contains fake 11 gram coins.

To help you find the bag of fake coins, you have a digital scale which will give you the exact weight of any amount of coins up to 1500 grams. Any amount over 1500 grams will cause the scale to spit out a random value.

How many bags (N) can you have and still be able to tell which bag contains the fake coins if you can only use the scale three times?

 See The Solution Submitted by Brian Smith Rating: 4.1429 (14 votes)

 Subject Author Date re: 182 David Frazer 2004-01-22 18:12:37 re: 182 Brian Wainscott 2004-01-15 14:04:26 182 Dan Porter 2004-01-15 11:35:15 possible solution? Angel 2003-08-25 01:56:26 My best so far Brian Wainscott 2003-07-29 09:12:23 re(6): solution (plus one)--Still more Brian Wainscott 2003-07-29 06:42:48 re(5): solution (plus one)--Even More Charlie 2003-07-28 15:53:01 re(4): solution (plus one)--Even More Charlie 2003-07-28 15:50:13 No Subject Charlie 2003-07-28 15:49:36 re(3): solution (plus one) Brian Wainscott 2003-07-28 13:35:23 re(2): solution (plus one) Charlie 2003-07-26 10:18:22 re: solution (plus one) Bryan 2003-07-25 12:55:31 re: the math... the wrong math Rich Rocket 2003-07-25 11:14:48 the math Rich Rocket 2003-07-25 11:11:47 solution Charlie 2003-07-25 11:08:52 A start Lewis 2003-07-25 09:49:02

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