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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