Reposting this riddle from
Tanya Khovanova's Math Blog, so that I can put the solution behind a link:
Four wizards, A, B, C, and D, were given three cards each. They were told that the cards had numbers from 1 to 12 written without repeats. The wizards only knew their own three numbers and had the following exchange.
A: "I have number 8 on one of my
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