Question

How do I find the least upper bound of a set?

Answer 1

Refer to explanation

Explanation:

First we define what is Upper Bound of a Set

Any number that is greater than or equal to all of the elements of the set.

Hence the least upper bound is

The smallest of all upper bounds of a set of numbers.

For example, the least upper bound of the interval `(5, 7)` is `7`.