Combinatorics Concepts
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combination
a collection of distinct objects
permutation
an arrangement of distinct objects in order
nCr
the number of combinations of r objects chosen from a set of n objects
nPr
the number of permutations of r objects chosen from a set of n objects
factorial
the product of the natural numbers less than or equal to the given number
special permutation rule
the rule that states that the number of permutation of n objects is n!
basic counting principle
the rule that states that when there are m ways to do one thing, and n ways to do another, then altogether there are m×n ways of doing both