Introduction to Combinatorics by UToronto
Combinatotics is about counting without really counting
all possible cases one by one. This PDF covers the following topics related
to Combinatorics : Introduction, The Pigeonhole Principle, The Principle of
Extremals, The Principle of Invariants, Permutations and Combinations,
Combinations with Repetition, Inclusion–Exclusion principle, Recurrence
Relations, Generating Functions, Partitions of Natural Numbers.
Author(s): Stefanos Aretakis, University of
Toronto, Scarborough
63 Pages