A woman with the 2nd blood group applied to the forensic medical examination in order to establish the paternity

A woman with the 2nd blood group applied to the forensic medical examination in order to establish the paternity of a newborn child with the 1st blood group, presumably the father has the 3rd blood group. Whether he is the father of this child or not. (% case)

A0 (II blood group) – woman; B0 (III blood group) – male, presumed father; 00 (I blood group) – a newborn child.

P: A0 (II) * B0 (III)

G: A 0 B 0

F1: AB (IV) A0 (II) B0 (III) 00 (I)

Answer: the probability of paternity in this case is 25%.