A CBC is a complete blood count. If the blood count test comes back as "normal," the person has normal blood levels, including red and white cell counts, sodium, potassium, and chloride levels,...
Not necessarily. For a counterexample, A and C could be the same set.
No. A can be independent of both B and C and this doesn't give use any information about the relationship between B and C.
Yes. A = B = C
Yes.