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(A ∩ C) =5, n(A ∩ B ∩ C) =2, n(B ∩ C)= 6, n (B - A) = 10, n(B U C)= 23, n(A ∩ C)=7, n(A U B U C)= 31
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