# 
## Overview
The **`choose()` function** in R is used to calculate the number of sets with `n` elements that can be chosen from a set with `k` elements.

Mathematically:

choose (k, n) = $\frac{n!}{k!(n-k)!}$

> **Note**:  `n` must always be greater than `k`.
## Syntax
```
choose(k, n)
```
## Parameters
The `choose()` function takes the following parameter values:

* **`n`**: This represents the number of elements of a given set.
* **`k`**: This represents the number of elements of another set.

## Example
Let's look at the code below:


# creating the number elements
n <- 3

# number of elements of a particular set
k <- 5

# use of choose() function to find how many times a set with 5 elements can be choosen from a set with 3 elements.
print(choose(k, n))



## Explanation 

* **Line 1:** We obtain the number of elements.

* **Line 5:** We obtain the number of elements of a particular set.

* **Line 8:** We call the built-in function `choose()` with the parameters `k` and `n`.
 
Mathematically:

choose (n, k) = $\frac{n!}{k!(n-k)!}$

choose (5, 3) = $\frac{5!}{3!(5-3)!}$ = $\frac{5!}{3!(2)!}$= 10

Therefore, only `10` sets can be formed of a set with `5` elements chosen from another set having `3` elements.




What is the choose() function in R?

It calculates the number of ways to choose k elements from n. E.g., choose(5, 3) = 10.