if N(B)=10, N(A n B)=2 and N(A U B)=19 what is N(A)?

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answerhappygod
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if N(B)=10, N(A n B)=2 and N(A U B)=19 what is N(A)?

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if N(B)=10, N(A n B)=2 and N(A U B)=19 what is N(A)?
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