TABLE OF CONTENTS

Transversals of Latin Squares

• Transversals
• Transversals of an order 10 square

Clock (Modular) Arithmetic

• The basics
• More clock arithmetic
• And yet more clock arithmetic
• I'm the GREATEST common divisor
• Secret Decoder Rings
• A Better Secret Decoder Ring
• The PostNET Bar Code
• What is an ISBN?

Pascal's Triangle

• Binomial Coefficients
• A formula for C(n,k)
• Pascal's Triangle mod(n) - Part I
• Pascal's Triangle mod(n) - Part II (partial)

Chess Problems

• Chess Domination Problems
• Chess Problem Solutions

written by Bill Cherowitzo (william.cherowitzo@cudenver.edu)