Section 1
Combinatorics
Book
Version 13
By Boundless
By Boundless
Boundless Algebra
Algebra
by Boundless
5 concepts
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Counting Rules and Techniques
Combinatorics is a branch of mathematics concerning the study of finite or countable discrete structures.
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Permutations
A permutation of a set of objects is an arrangement of those objects in a particular order; the number of permutations can be counted.
Permutations of Distinguishable Objects
The number of permutations of distinct elements can be calculated when not all elements from a given set are used.
Permutations of Nondistinguishable Objects
The expression revealing the number of permutations of distinct items can be modified if not all items in a set are distinct.
Combinations
A combination is a way of selecting several things out of a larger group, where (unlike permutations) order does not matter.