Permutation

A way, esp. one of several possible variations, in which a set or number of things can be ordered or arranged

• http://www.mathsisfun.com/combinatorics/combinations-permutations.html
• http://mathworld.wolfram.com/Permutation.html
• http://rosettacode.org/wiki/Permutations

De Morgan's Law

In propositional calculus form: where: *¬ is the negation operator (NOT) *∧ is the conjunction operator (AND) *∨ is the disjunction operator (OR) *⇔ means logically equivalent (if and only if).

• http://en.wikipedia.org/wiki/De_Morgan's_laws
• http://planetmath.org/DeMorgansLaws.html
• http://en.wikibooks.org/wiki/A-level_Computing/AQA/Computer_Components,_The_Stored_Program_Concept_and_the_Internet/Fundamental_Hardware_Elements_of_Computers/De_Morgan's_Laws

Permutation

A way, esp. one of several possible variations, in which a set or number of things can be ordered or arranged

• http://www.mathsisfun.com/combinatorics/combinations-permutations.html
• http://mathworld.wolfram.com/Permutation.html
• http://rosettacode.org/wiki/Permutations

lab46:~$ Enter First Number For Permutation: 3
Enter Second Number For Permutation: 1

Permutation Results: 3! / 1! = 5
(3,1), (2,1), (1,1), (1,3), (1,2)