What ABO antigens are present on the red blood cells of Mr. Green's blood?
Mr. Green
Anti A serum - no clump
Anti B serum - clump
Anti Rh serum - no clump
Based on the observations with the anti-A and anti-B sera, we can determine the ABO antigens present on Mr. Green's red blood cells.
If the anti-A serum did not cause any clumping, it means that Mr. Green's blood does not have the A antigen on the red blood cells.
However, the anti-B serum did cause clumping, indicating that Mr. Green's blood does have the B antigen on the red blood cells.
From this information, we can conclude that Mr. Green's blood has B antigens on the red blood cells, but does not have A antigens.
Please note that we don't have enough information to determine the presence or absence of the Rh antigen (also known as Rh factor) on Mr. Green's red blood cells. The anti-Rh serum not causing clumping only tells us that Mr. Green's blood doesn't have antibodies against the Rh antigen. Further testing would be required to determine the presence or absence of the Rh antigen.