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: '{18}', Set2: '{1, 5, 7, 11, 13, 14, 16}'. How many elements are there in the union of Set1 and Set2 ?
8
The union of Set1 and Set2 is the smallest set that contains all the elements of both sets.\nSet1 has only one element: '18'.\nSet2 has 7 elements: '1', '5', '7', '11', 13, 14, 16.\nTherefore, the union of Set1 and Set2 is {'18','1','5','7','11','13','14','16'} which has 8 elements..