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Scientific Psychic

Prediction: Your result will be 18

  • Think of a number.
  • Add 7 to it.
  • Subtract 2.
  • Subtract your original number.
  • Multiply by 4.
  • Subtract 2.

Explanation:


This problem gives the illusion of guessing an unknown number, but the unknown has been cancelled mathematically.
( X + 7 - 2 - X ) × 4 - 2 = 18

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