The set shown in the image is:

$\{a, 1, 3, b, 3, 81\}$

Now, in sets, repeated elements are not counted more than once. Here, the element 3 appears twice, but we only count it once. Thus, the distinct elements in the set are:

$\{a, 1, 3, b, 81\}$

Therefore, the set contains 5 distinct elements.

Would you like further details or have any other questions?

Here are some related questions to explore:

1. What is the difference between a set and a list?
2. How are elements treated in a set when compared to a multiset?
3. Can sets in mathematics have an infinite number of elements?
4. How are sets used in real-life applications like databases or programming?
5. What are some properties of sets, such as union or intersection?

Tip: Sets do not allow duplicate elements, unlike lists or multisets where repetitions are counted.