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Puzzle: Sitting Close

August 12, 2009 pm31 11:51 pm

People trade problems at math conferences for math teachers. This one, which I picked up last week, I liked a lot. See what you think.

Ten people are seated on a stage, in a row of ten seats. They get up, run around, and sit back down… and all end up in the seat they started in, or just one away from the seat they started in. How many ways could this happen?

Put questions in the comments, below.

For answers, click here.

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2 Comments leave one →
  1. Eric permalink
    August 13, 2009 pm31 3:15 pm 3:15 pm

    Are the seats in a ring or a row?

    • August 14, 2009 am31 1:17 am 1:17 am

      ha! A row. Let’s make a ring the next puzzle. Or an extension/supplement.

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