👉 Countability is a concept in mathematics that refers to whether or not a set can be counted on, meaning it has an upper bound. In other words, if we have a set S and we want to know how many elements are there in it, we can use a method such as counting the elements or using a formula. For example, consider the set {1, 2, 3} of integers. We can count its elements by listing them from 1 to 4 (since
