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.

Set1: '{1, 3, 5, 7, 9}', Set2: '{19, 12, 6, 15}'. How many elements are there in the union of Set1 and Set2 ?
9
Given the list {1, 3, 5, 7, 9} as Set1 and {19, 12, 6, 15} as Set2.\nThe union of the two sets would be:\n{1}\n{3}\n{5}\n{7}\n{9}\n\nWith the elements of Set 2:\n19\t12\t6\t15\tTotal: 52

Total: 9 + 52 = 61..