What is the interval notation?

Question

The set of real numbers between 1 and 5, inclusive.

 

[] or ()

Answer 1

Hint: inclusive means that the set would include 1 and 5.

(1,5) would not include 1 or 5 because () denotes an open interval.
[1,5] would include 1 and 5 because [] denotes a closed interval.