TASK 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.
PROBLEM: Set1: '{1, 2, 4, 5, 7, 11, 18}', Set2: '{17, 19, 20}'. How many elements are there in the union of Set1 and Set2 ?

SOLUTION: 10

PROBLEM: Set1: '{7, 11, 12, 13, 14, 15, 18, 19, 20}', Set2: '{2, 3, 4, 8, 9, 11, 13, 15, 16, 20}'. How many elements are there in the union of Set1 and Set2 ?

SOLUTION: 15

PROBLEM: Set1: '{6}', Set2: '{11}'. How many elements are there in the union of Set1 and Set2 ?

SOLUTION:
2