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Apply the formula n(A U B) = n(A) + n(B) - n(A n B)
we want to solve for n(B)
Plug in the numbers. Where n(A U B) = 18, n(A) = 12, n(A n B) = 8
18 = 12 + n(B) - 8
18 = 4 + n(B)
n(B) = 14
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