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 One out of ninety (Posted on 2013-12-17)
You are presented with a set of 90 coins, appearing identical.
Actually, 89 of them are identical, but one has a different weight.
Using balance scales you have to find the odd coin,
paying \$10 each time you use the scales.

What is the maximal (i.e. the worst case) cost to accomplish it?

 Submitted by Ady TZIDON Rating: 4.0000 (1 votes) Solution: (Hide) \$50 (5 weighings) WILL DO. See all Steve Herman's posts.

 Subject Author Date One out of 121 !! Steve Herman 2015-12-19 19:20:20 re: One out of One Hundred Twenty! Steve Herman 2015-12-18 20:18:01 One out of One Hundred Twenty! Brian Smith 2015-12-18 00:03:15 One out of 121? Steve Herman 2013-12-18 22:34:02 One out of 92! (spoiler) Steve Herman 2013-12-18 12:58:52 Minimum of the minimum of the maximum Steve Herman 2013-12-17 16:27:22 Where there's a will, there's a weigh (spoiler?) Steve Herman 2013-12-17 16:02:36

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