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 6 coins (Posted on 2016-01-13)
There are 6 coins weighing 1, 2, 3, 4, 5 and 6 grams that look the same, except for their labels. The labels are supposed to display the weights of the coins.

How can you determine whether all the labels are correct,
using the balance scale only twice?

 Submitted by Ady TZIDON Rating: 4.2500 (4 votes) Solution: (Hide) 1st: 6 vs 1+2+3 iff 6 = 1+2+3 then 2nd: 3+5 vs 6+1 iff 3+5 > 6+1 ok

 Subject Author Date re(2): short solution - spoiler Charlie 2016-01-14 19:59:00 re: short solution - spoiler Charlie 2016-01-13 19:29:50 @ SH Ady TZIDON 2016-01-13 18:06:11 Chapeau tipping Steve Herman 2016-01-13 17:50:41 short solution - spoiler Ady TZIDON 2016-01-13 17:18:19 computer solution Charlie 2016-01-13 14:32:07 computer attempt Charlie 2016-01-13 13:42:02 re: Solution Charlie 2016-01-13 12:40:10 re: Solution / counterexample Jer 2016-01-13 12:21:16 Solution Brian Smith 2016-01-13 11:26:07

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