This preview shows page 1. Sign up to view the full content.
Unformatted text preview: e;
Deﬁnition The factorial of a non–negative integer n, denoted by n!,
is the product of all positive integers less than or equal to
5! = 5 × 4 × 3 × 2 × 1 = 120 Basic Counting
0! = 1 4.4 Notes Permutation
Deﬁnition (Permutation) Basic Counting
Combinations Notes A permutation of r objects from a collection of n objects is
any ordered arrangement of r distinct objects from the n
Notation: (n)r or n Pr
Formula: (n)r = n!
(n−r )! Basic Counting
Combinations The special permutation rule states that anything permute
itself is equivalent to itself factorial.
View Full Document