THE ART AND CRAFT OF PROBLEM SOLVING Second Edition Paul Zeitz University of San Francisco B.e:ENTENNIAL ? II i 1 807 ? z z ? ?WILEY? z z ? 2007 ! - ? II r BICENTENNIAL John Wiley & Sons, Inc. ACQUISITIONS EDITOR PROJECT EDITOR EDITORIAL ASSIST ANT SENIOR PRODUCTION EDITOR MARKETING MANAGER COVER DESIGNER COVER PHOTO Angela Battle Jennifer Battista Daniel Grace Ken Santor Amy Sell Michael St. Martine Steve Casimiro/The Image Bank/Getty Images, Inc. This book was set in LaTeX by the author and printed and bound by Malloy, Inc . The cover was printed by Phoenix Color. This book is printed on acid free paper. 00 Copyright ? 2007 John Wiley & Sons, Inc. All rights reserved.