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The union of sets A and B, denoted as A U B, includes all the unique elements from both sets. To find the number of elements in A U B, we need to count all the distinct elements present in both sets.

Set A = {1, 2, 3, 4, 5, 6} Set B = {2, 3, 4, 5, 6, 7, 8}

By combining the elements from both sets and removing duplicates, we obtain: A U B = {1, 2, 3, 4, 5, 6, 7, 8}

The number of elements in A U B is 8.

Why the answer is 8 and not {1,2,3,4,5,6,7,8}???

The answer is 8 , Union basically add both the functions

The answer is 8, the union of A and B would be the digits 1 through 8. They are treating this as a solely math problem.