In this lesson, we’ll learn about two special numbers unique numbersa value which appears in the data exactly once and distinct numbersa value that does not repeat in a set of data but it does not have to be the only value that appears in the set, and how to compute them in the given data.

the terms “unique” and “distinct” are used to describe the elements of a set or collection.

A “unique” element is an element that appears only once in a set or collection. If an element appears more than once in a set, it is not considered to be unique.

A “distinct” element is an element that is different from all other elements in a set or collection. It doesn’t matter how many times an element appears in the set, as long as it is different from all other elements, it is considered to be distinct.

In other words, all unique elements are distinct, but not all distinct elements are unique.

For example, consider the set [1, 2, 3, 4]. Elements 1, 2, 3, and 4 are all unique and distinct elements of the set. If we add element 4 again, the set becomes [1, 2, 3, 4, 4]. In this set, the elements 1, 2, 3, and 4 are still distinct, but 4 is no longer unique because it appears twice in the set.

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