Unformatted text preview: = 3!
3!
=
= 3! = 3 × 2 × 1 = 6
(3 − 3)!
0!
4.5 Permutation Basic Counting
Rule;
Permutations;
Combinations Basic Counting
Rules
Permutations
Combinations 4.6 Notes Basic Counting
Rule;
Permutations;
Combinations Combination
Deﬁnition Notes A combination of r objects from a collection of n objects is
any unordered arrangement of r distinct objects from the
n total objects.
Remark: The difference between a combination and a
permutation is that order of the objects is not important
for a combination.
Notation:
Formula: n
r
n
r Basic Counting
Rules
Permutations
Combinations or n Cr
= n!
(n−r )!×r ! 4.7 Combination Basic Counting
Rule;
Permutations;
Combinations Basic Counting
Rules
Permutations
Combinations 4.8 Notes Basic Coun...
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 Spring '08
 MARTIN
 Combinatorics, Counting, Probability, Basic Counting

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