Im a 10th grader and i want to learn combinatorics. I donot have a mentor and planning to self study it. Im interested in solving Olympiad probelms and maybe participate as well. I want a book that explains combinatorics to me like a kid!
I know a bit of graph theory and a little bit of generating functions. I would love to learn recurrence relations. I would love to see a book within this topics as well. Thanks!
I have found Principles of Combinatorics by Chen Chuang Chong quite easy to read and very explicitly presented. It also includes a number of problems from IMO, Putnam and Regional Olympiads.