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"Four fours" is a mathematical puzzle that involves using exactly four instances of the number four and various mathematical operations to create the numbers from 0 to 100. The challenge is to find expressions for each number using only four instances of the digit 4 and standard mathematical operations, such as addition, subtraction, multiplication, division, square roots, factorials, and concatenation.

Ancestors (5)

  1. Mathematical games
  2. Recreational mathematics
  3. Fields of mathematics
  4. Mathematics
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