By Daniel A. Marcus

This booklet teaches the artwork of enumeration, or counting, by means of prime the reader via a sequence of rigorously selected difficulties which are prepared strategically to introduce techniques in a logical order and in a provocative manner. it truly is prepared in 8 sections, the 1st 4 of which disguise the elemental combinatorial entities of strings, mixtures, distributions, and walls. The final 4 conceal the distinct counting tools of inclusion and exclusion, recurrence family members, producing services, and the tools of Pуlya and Redfield that may be characterised as "counting modulo symmetry. the original structure combines gains of a conventional textbook with these of an issue booklet. the subject material is gifted via a chain of roughly 250 difficulties, with connecting textual content the place acceptable, and is supplemented by means of nearly two hundred extra difficulties for homework assignments. Many functions to likelihood are integrated through the e-book. whereas meant essentially to be used because the textual content for a college-level path taken by way of arithmetic, computing device technology, and engineering scholars, the ebook is appropriate to boot for a normal schooling direction at an exceptional liberal arts collage, or for self examine.

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**Additional resources for Combinatorics: A Problem Oriented Approach**

**Example text**

How long would it take you to list them all if each sequence took one second to write down? How many sequences are there of n digits in which all the digits are different? How many sequences are there of n digits in which no two consecutive digits are the same? 3A In three races there are 10, 8, and 6 horses running, respectively. You win a jackpot prize if you correctly predict the first 3 horses, in the right order (assuming no dead heats), in each race. How many different predictions can be made?

6 The Binomial Theorem For all variables a, b, and each positive integer n, (a + b)n = an + C(n,1)an−1 b + C(n,2)an−2 b2 + … + bn, that is, n (a + b)n = ∑C(n,r )a b , as C(n, 0) = C(n,n) = 1. n−r r r =0 Proof Consider the product (a + b)(a + b) … (a + b) with n pairs of brackets. When we multiply out this product, each separate term that arises comes from choosing either a or b from each pair of brackets and then multiplying these a’s and b’s together. We obtain the term an−r br each time we choose b from r of these pairs of brackets and a from the remaining n−r pairs.

Straight: five cards of consecutive ranks but not all in the same suit (note that for this purpose an ace may count either low or high, so that both A, 2, 3, 4, 5 and 10, J, Q, K, A count as consecutive ranks), for example, 7♦, 8♦, 9♥, 10♠, J♥. Straight flush: five cards of consecutive ranks (again, an ace may count either low or high) and in the same suit, for example, 4♥, 5♥, 6♥, 7♥, 8♥. vii. Three of a kind: three cards of one rank and two cards of two different ranks, for example, 9♥, 9♣, 9♦, 4♥, Q♣.