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 Internationa.
Birkhauser 102 combinatorial problems: from the training of the usa imo team/titu andreescu
