3 The Solutions

  3.1 Problem 1: Seven Digits Puzzle
  3.2 Problem 2: The Clock Puzzle
  3.3 Problem 3: The 6-Knights Puzzle
  3.4 Problem 4: The 3-jug Problem
  3.5 Problem 5: The Fake Coin Puzzle I
  3.6 Problem 6: The Fake Coin Puzzle II
  3.7 Problem 7: The Horse Race Puzzle
  3.8 Problem 8: Adding Numbers
  3.9 Problem 9: 3d-Diagonal
  3.10 Problem 10: Square Inside a Triangle
  3.11 Problem 11: Birthday Paradox
  3.12 Problem 12: Length of Loch Ness Monster
  3.13 Problem 13: Price of the Ball
  3.14 Problem 14: Postman Problem
  3.15 Problem 15: One Unit Missing
  3.16 Problem 16: How old am I?
  3.17 Problem 17: 7 Digits Puzzle (repeat)
  3.18 Problem 18: The Clock Puzzle (repeat)