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Keywords:

  • Teaching;
  • Birthdays;
  • Coincidences;
  • Counter-intuitive results;
  • Under/Overestimation;
  • Combinatorial growth

Summary

The article asks about the minimal number of persons required for achieving a probability 1/2 that a. At least two share a birthday, b. At least one shares the reader's birthday. A basic question about the necessary number of checks underlies both problems.