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Four Weights (Posted on 2004-07-25) Difficulty: 3 of 5
You have 4 weights weighing 2,3,5 and 7 pounds. The problem is none of them are marked. What is the fewest number of weighings you need using a balance scale figure out which weights are which?

See The Solution Submitted by Brian Smith    
Rating: 3.5000 (8 votes)

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re(3): done in 3 weighings.... I think =P | Comment 17 of 33 |
(In reply to re(2): done in 3 weighings.... I think =P by Vina)

Your method is dependant on the initial weighing.  If the initial weighing is not balanced, then your method fails.  A proper solution must account for all possible results of the first weighing.
  Posted by Brian Smith on 2004-07-26 21:53:33

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