102 Combinatorial Problems

"Andreescu's 51 'introductory problems' and 51 'advanced problems,' all novel, would nicely supplement any university course in combinatorics or discrete mathematics. This volume contains detailed solutions, sometimes multiple solutions, for all the problems, and some solutions offer additional twists for further thought . . . "—CHOICE

102 Combinatorial Problems consists of carefully selected problems that have been used in the training and testing of the USA International Mathematical Olympiad (IMO) team. The text provides in-depth enrichment in the important areas of combinatorics by systematically reorganizing and enhancing problem-solving tactics and strategies. The book gradually builds combinatorial skills and techniques and not only broadens the student's view of mathematics, but is also excellent for training teachers.

Problems in this book are divided into 2 sets, with each set containing 51 problems. Problems in the first set are introductory ones (hence, relatively easy), and that in the second set are advanced problems (And harder, much harder indeed in the last few problems). Problems are very well selected and carefully organized according to their difficulty and technic involved. They span from the very easy first some enumerative problems to the really hard IMO-level, even notorious National-MO problems. Moreover, problems are up-to-date hence it avoids well-known cliche problems. The book is published in the end of 2002, and in this book some of the 102 problems are selected from the IMO that year!

As a regular lecturer of Taiwan's IMO team, I highly recommend this problem book.