Permutations

• Permutation - arrangement of all or part of a set of objects with proper regard to order

  (order matters)
• The number of permutations of n taken r at a time - P(n,r).
• (P(n,r) = n! / (n-r)!) where ! means factorial.
• Fundamental Counting Principle - a rule used to count the total number of possible outcomes in a situation.
• FACTORIAL - !
• Permutation of n taken r at a time, equals n! / (n-r)!
• Circular Permutation - the arrangement of objects in a circular manner
• Factorial notation can be applied in various situations such as evaluating and expressing numbers.