2 The Problems

  2.1 Problem 1: Seven Digits Puzzle
  2.2 Problem 2: The Clock Puzzle
  2.3 Problem 3: The 6-Knights Puzzle
  2.4 Problem 4: The 3-jug Problem
  2.5 Problem 5: The Fake Coin Puzzle I
  2.6 Problem 6: The Fake Coin Puzzle II
  2.7 Problem 7: The Horse Race Puzzle
  2.8 Problem 8: Adding Numbers
  2.9 Problem 9: 3d-Diagonal
  2.10 Problem 10: Square Inside a Triangle
  2.11 Problem 11: Birthday Paradox
  2.12 Problem 12: Length of Loch Ness Monster
  2.13 Problem 13: Price of the Ball
  2.14 Problem 14: Postman Problem
  2.15 Problem 15: One Unit Missing
  2.16 Problem 16: How old am I?
  2.17 Problem 17: 7-Digits Puzzle (repeat)
  2.18 Problem 18: The Clock Puzzle (repeat)