Question

what is permutation and combination.?​

Answer 1

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What do you mean by permutations and combinations? A permutation is an act of arranging the objects or numbers in order. Combinations are the way of selecting the objects or numbers from a group of objects or collection, in such a way that the order of the objects does not matter.12-Sep-2020

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Answer 2

What is Permutation?

In mathematics, permutation relates to the act of arranging all the members of a set into some sequence or order. In other words, if the set is already ordered, then the rearranging of its elements is called the process of permuting. Permutations occur, in more or less prominent ways, in almost every area of mathematics. They often arise when different orderings on certain finite sets are considered.

What is a Combination?

The combination is a way of selecting items from a collection, such that (unlike permutations) the order of selection does not matter. In smaller cases, it is possible to count the number of combinations. Combination refers to the combination of n things taken k at a time without repetition. To refer to combinations in which repetition is allowed, the terms k-selection or k-combination with repetition are often used.

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== Permutation Formula

A permutation is the choice of r things from a set of n things without replacement and where the order matters.

$nPr = (n!) / (n-r)!$

== Combination Formula

A combination is the choice of r things from a set of n things without replacement and where order does not matter.

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