Question

A={2,4,6,8,10} and B={1,2,3,4,5}

Answer 1

The union of the sets is the combination of all the elements of the sets with them listed only once. In the given above, A U B = (1, 2, 3, 4,  5, 6, 8, 10). The numbers 2 and 4 are repeated but we have to write them only once. The answer is letter B.