find, if possible, the number of elements in sets A, B, and C using the given information. If there is an inconsistency in the information, state where it occurs.
n(U)=22, n(A - B)=9, n(A ∩ B ∩ C) =2, n (A - C)= 4, n(B ∩ C)= 5, n(A ∩ B)= 3, n(A U B U C′)= 7
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