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Conjuntos: Ache n(A ? B). Sejam A, B e C conjuntos.
Sejam A, B e C conjuntos tais que n(A)= 2x-3, n(B)= x-2, n(C)= 3x-4 e n(AUBUC)=x^2 onde n(S) é o número de elementos no conjunto S. Ache n(A ? B).
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