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QUESTION: What is the maximum number of pieces you can cut a donut into using three planar slices?ANSWER:

18.Now, the question is, how?

If you can't figure out how, how many pieces can

youget with three planar slices?

We received only a few solutions to this problem in 1994, and unfortunately none of the solutions was what we were looking for. But congratulations to Stefan Axelsson, age 13, from Hovåsskolan, Gothenburg, Sweden, who submitted the following correct answer in October 1995:

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