Given:
– A = {1, 2, 3, 4, 5, 6, 7, 8, 9}
– B = {2, 4, 6, 8}

A union B (A ∪ B):
A ∪ B includes all elements from both sets without repetition.
So, A ∪ B = {1, 2, 3, 4, 5, 6, 7, 8, 9}

A intersection B (A ∩ B):
A ∩ B includes only the elements that are in both sets.
So, A ∩ B = {2, 4, 6, 8}

Final answer:
– A ∪ B = {1, 2, 3, 4, 5, 6, 7, 8, 9}
– A ∩ B = {2, 4, 6, 8}