Subject: Old-Ball puzzle
Date: Tue, 29 Oct 1996 08:05:51
From: Sorrel Jakins

Dear Mr. Bogomolny,

I have tried for a year to figure out the following:

You have 12 balls, one of them differs in mass from all the rest. You have a comparative scale, which will self-destruct after 3 uses. How can you tell which ball is different?

Can you help?
Sorrel Jakins
Computer Nerd

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