Can a child have blood group 'O' if his parents have blood group 'A' and 'B' Explain.

How is it possible for a child to have blood group O if the parents have blood group A and B?

The probality of a having a child with blood group O to parents with blood groups A and B is

A child of blood group O cannot have parents of blood groups

A child of blood group O cannot have parents of blood groups

A child of blood group 'O' cannot have parents of blood groups:

A child of blood group O cannot have parents of blood groups

A child of blood group 'O' cannot have parents of blood groups:

A child has blood group 'O'. If the father has the blood group 'A' and the mother has the blood group 'B' . What will be the genotypes of the parents ?