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Many coins - one fake (Posted on 2003-05-14) Difficulty: 5 of 5
Given a balance scale that is sure to break after X weighings, find an equation for the largest number of coins N, from which you can determine a fake coin that has the wrong weight if

A: You know whether the fake is lighter or heavier

B: You do not know whether the fake is lighter or heavier

(Assume only one of the N coins is fake)

See The Solution Submitted by Jonathan Waltz    
Rating: 3.7143 (7 votes)

Comments: ( You must be logged in to post comments.)
  Subject Author Date
SolutionFrankM2008-02-16 13:07:19
my solutiongeoffrey2003-10-09 14:53:17
re: solution to BJohn Smith2003-09-03 16:00:26
re(3): solution to B - apologiesSanjay2003-05-19 09:00:57
re(4): solution to Bpleasance2003-05-19 06:49:49
re(3): solution to BCharlie2003-05-19 04:30:47
re(2): solution to Bpleasance2003-05-19 03:18:05
re: solution to BSanjay2003-05-18 10:12:28
re: solution to BCharlie2003-05-18 04:48:18
solution to Bpleasance2003-05-18 01:55:49
SolutionThe answer to 'fakeness'Sanjay2003-05-16 16:31:42
another approach to problem Bpleasance2003-05-16 02:35:00
re(4): Weighty Solution (maybe!)Chris2003-05-15 06:53:29
re(3): Weighty Solution (maybe!)Chris2003-05-15 06:43:16
re(3): Weighty Solution (maybe!)Hank2003-05-15 03:07:01
re(2): Weighty Solution (maybe!)Gamer2003-05-14 12:22:35
re: Weighty Solution (maybe!)Chris2003-05-14 10:48:06
SolutionWeighty Solution (maybe!)Chris2003-05-14 10:30:45
Weighing in on this one....Brian Smith2003-05-14 09:21:22
Some Thoughtssolution for A; thoughts on BCharlie2003-05-14 09:17:00
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