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      Scientific American April 1967

      Mathematical Games

      The amazing feats of professional mental calculators, and some tricks of the trade

      • By Martin Gardner on April 1, 1967

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      More in the April 1967 issue of Scientific American
      • Letters to the Editors, April 1967
      • The Authors
      • 50 and 100 Years Ago: April 1967
      View Full Contents
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