Good Book On Combinatorics What is your recommendation for an in-depth introductory combinatoric book? A book that doesn't just tell you about the multiplication principle, but rather shows the whole logic behind the questions with full proofs. The book should be for a first-year-student in college. Do you know a good book on the subject?
Thanks.

Try Principles and Techniques in Combinatorics by Chen Chuan Chong and Koh Khee Meng or Combinatorics by Peter Cameron. The latter is more advanced and has more topics.
