Combination Formula
The number of combinations of n different things taken r at a time is given by
nCr = n! ⁄ r! (n-r)! ,0 < r ≤n
where,
- n is the size of the set from which elements are permuted
- r is the size of each permutation
- ! is factorial operator
Combinations Formula with Examples
Combination is a way of selecting items from a collection of items in combination we do not look at the order of selecting items, but our main attention is on the total number of selected items from a given set of items. For example- suppose that we have three numbers say, a, b, and c. Then in how many ways we can select two numbers is known as a combination.
Table of Content
- What is Combinations?
- Combination Formula
- Relation between Combination Formula and Permutation Formula
- Difference between Permutations and Combinations
- What is Factorial?