Kim O'Hara  |
Location:
Washington |
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  #17112
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 Friday, 19 December 2014 05:26 PM
I got it about 15 years ago on the third roll. Now I introduce it to my high school math classes about once every 4 years (so that they can all graduate before the new batch arrives). This year, it's time again. We're going to do it as a puzzle before Christmas vacation.
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