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Sets A and B have 2 as the intersection. universal set is {2,3,4,5,6,7,8,9}
n(U)= 8
n(A)=?
n(B)=5
therefore, n(U)=n(A)+n(B)
8=5+?, subtract 5 from both sides
8-5=5-5+?
3=n(A)
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