Skip counting involves counting by a specific number other than 1. Finger counting varies by culture: US uses index, UK uses thumb, Japan uses fist. Tally marks show counting over time using vertical lines. Verbal counting involves speaking numbers aloud
Counting means determining quantity of objects in a set. Counting numbers, also called natural numbers, start from 1. Zero is not a counting number. Counting is first taught in kindergarten
Textbook provides guided tour of combinatorics for one semester or independent study. Covers enumeration, existence, construction, and optimization questions. Contains approximately 350 reading questions throughout eight chapters
Combinatorics is mathematics concerned with counting and properties of finite structures. It has applications from logic to computer science and evolutionary biology. The full scope of combinatorics is not universally agreed upon
Permutation arranges objects in sequence, while combination selects items without order. Permutations occur in almost every area of mathematics. Combinations can be counted in smaller cases