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 One of Sixteen (Posted on 2015-12-29)
I have two sets of 8 coins. In one set the coins weigh 30g each, in the other set the coins weigh 31g each.
Unfortunately they got mixed together in one big pile of 16 coins. I want to identify one coin. It can be from either set.

(Easy) Using a balance scale, identify a coin in four weighings.

(Hard) Identify a coin in just three weighings.

 See The Solution Submitted by Brian Smith Rating: 4.0000 (3 votes)

 Subject Author Date re(4): Short solution. broll 2016-01-12 22:14:47 re(3): Short solution. Jer 2016-01-12 10:20:32 re(2): Short solution. broll 2016-01-11 23:08:08 re: Short solution. Jer 2016-01-11 12:30:33 re(2): What's the problem? (and a spoiler) Steve Herman 2016-01-01 10:34:53 re: What's the problem? (and a spoiler) Brian Smith 2015-12-31 13:06:07 What's the problem? (and a spoiler) Steve Herman 2015-12-31 12:16:44 re: Short solution. Ady TZIDON 2015-12-31 10:49:14 Short solution. broll 2015-12-30 22:09:31 re: Solution (hard) Ady TZIDON 2015-12-30 17:01:14 Solution (hard) Paul 2015-12-30 12:08:39 Easy does it Steve Herman 2015-12-29 13:45:30

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