Part 1. Definition
In this task, you are given two sets, and you need to count the number of elements at the union of two given sets. A Set is shown by two curly braces and comma-separated numbers inside, like {1, 2, 3}. Union of two given sets is the smallest set which contains all the elements of both the sets. To find the union of two given sets, A and B is a set that consists of all the elements of A and all the elements of B such that no element is repeated.
Part 2. Example
Set1: '{2, 3, 6, 9, 10, 14, 15, 20}', Set2: '{3, 5, 7, 9, 12, 15, 16}'. How many elements are there in the union of Set1 and Set2 ?
Answer: 12
Explanation: The union of Set1 and Set2 is {2, 3, 5, 6, 7, 9, 10, 12, 14, 15, 16, 20}. It has 12 elements. So, the answer is 12.
Part 3. Exercise
Set1: '{2, 3, 15}', Set2: '{8}'. How many elements are there in the union of Set1 and Set2 ?
Answer:
4