Selection

Selection

## Definition / Concept

Selection means choosing objects from a given set without considering their order.

The number of ways of selecting $$r$$ objects from $$n$$ distinct objects is denoted by:

$$^nC_r$$

## Formula

$$^nC_r=\frac{n!}{r!(n-r)!}$$

## Usage

- Used whenever only selection matters and the order of selected objects is irrelevant.