# 3 basic counting rule permutations combinations

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Unformatted text preview: e; Permutations; Combinations Factorial Deﬁnition The factorial of a non–negative integer n, denoted by n!, is the product of all positive integers less than or equal to n. Example: 5! = 5 × 4 × 3 × 2 × 1 = 120 Basic Counting Rules Permutations Combinations Convention: 0! = 1 4.4 Notes Permutation Deﬁnition (Permutation) Basic Counting Rule; Permutations; Combinations Notes A permutation of r objects from a collection of n objects is any ordered arrangement of r distinct objects from the n objects. Notation: (n)r or n Pr Formula: (n)r = n! (n−r )! Basic Counting Rules Permutations Combinations The special permutation rule states that anything permute itself is equivalent to itself factorial. Example: (3)3...
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## This note was uploaded on 01/24/2014 for the course STAT 225 taught by Professor Martin during the Spring '08 term at Purdue University-West Lafayette.

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