1. Mr. Green's blood sample showed agglutination with anti-A, anti-B, and anti-Rh serum, indicating his blood type is AB Rh+. 2. Blood typing involves testing patient or donor blood samples with anti-A, anti-B, and anti-Rh serum to detect agglutination, which determines the presence or absence of A and B antigens and the Rh factor. 3. Taking multiple blood samples and calculating the average cell count is important for blood typing to obtain an accurate reading and minimize errors from a single sample.