Reason:
A U C = {1, 2, 3, 4, 5, 6, 7, 8} all the elements in A or C
1, 4 and 8 are the elements in the intersection of A and B
#A = 5 there are 5 elements in A
B'= {2, 5, 6, 7, 9} all elements not in B

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