Let A={1,3,9}, B={x| x is an even whole number less than 11}, C={2,6,8,12}, and D={x| x is an odd whole number less than 12} Find AB
AB is the set of elements that are in both set A and set B. From set A, we have the elements {1, 3, 9}, and from set B, we have the even whole numbers less than 11: {2, 4, 6, 8, 10}.
To find AB, we need to find the intersection of sets A and B, meaning we need to find the elements that are common to both sets.
The elements that are in both sets A and B are {2, 6, 8}. Therefore, AB = {2, 6, 8}.