Where are permutations and combinations used?
Click to see full answer
Herein, what is permutation and combination with an example?
Permutation and Combination. Permutation : It is the different arrangements of a given number of elements taken one by one, or some, or all at a time. For example, if we have two elements A and B, then there are two possible arrangements, AB and BA.
Likewise, how many ways can 4 numbers be arranged? But many of those are the same to us now, because we don't care what order! So, the permutations have 6 times as many possibilites. (Another example: 4 things can be placed in 4! = 4 × 3 × 2 × 1 = 24 different ways, try it for yourself!)
Likewise, what is the formula of permutation and combination?
Permutations and combinations. The number of permutations of n objects taken r at a time is determined by the following formula: P(n,r)=n! (n−r)!
What is an example of a combination?
A combination is a selection of all or part of a set of objects, without regard to the order in which objects are selected. For example, suppose we have a set of three letters: A, B, and C. We might ask how many ways we can select 2 letters from that set. Each possible selection would be an example of a combination.