Question

How do you write interval notation $?$

Answer 1

Writing interval notation:

Interval: The term “interval” means the range of numbers between the two given numbers.

The interval notation can be written in three different ways, such as:

Closed interval: It is describe as using square brackets “$[]$”. Here, both the end points are included. For example, $[1,5]$ means greater than or equal to $1$ and less than or equal to $5$.

Open interval: It is describe as using open brackets “$()$”. Here, both the ends are not included. For example, $(1,5)$ means greater than $1$ and less than $5$.

Half-open interval: It is describe by “$(]$” or “$[)$”. Here, one end point is included. $(1,5]$ means greater than $1$ and less than or equal to $5$. Similarly, $[1,5)$ means greater than or equal to $1$ and less than $5$.

Hence, we can write interval notation by three different ways.