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If n ( A ) =125, n ( B ) =105, and n ( A B ) =205, what is n ( A B )?

  1. Ifn(A) =125,n(B) =105, andn(AB) =205, what isn(AB)?
  2. Ifn(AB) =75,n(ABC) =115, andn(ACB) =45, what isn(AB)?

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