The Red Cross looks for three types of antigens in blood tests: A, B, and Rh. When the antigen A or B is present, it is listed, but if both of these antigens are absent, the blood is type O. If the Rh antigen is present, the blood is positive; otherwise, it is negative. If a laboratory technician reports the following results after testing the blood samples of 200 people, how many were classified as O negative?
Number of Samples | Antigen in Blood |
50 | A |
18 | B |
82 | Rh |
5 | A and B |
31 | A and Rh |
10 | B and Rh |
4 | A, B, and Rh |
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