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Verify n(AcupBcupC)=n(A)+n(B)+n(C)-n(Aca...

Verify `n(AcupBcupC)=n(A)+n(B)+n(C)-n(AcapB)-n(BcapC)-n(AcapC)+n(AcapBcapC)` for the following sets.
(i) A{a, c, e, f, h}, B = {c, d, e, f} and C = {a, b, c, f}
(ii) A = {1, 3, 5} B = {2, 3, 5, 6} and C = {1, 5, 6, 7}.

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