Is it possible for a woman with AB blood and a men with type B blood to have children with type A?

YES! If the woman has type AB blood type andthe man has type BO blood tye it is possible for them to have a child with AO blood type which registers as type A. It is rare though. Genetics tell us that they have a 50% chance of a baby with type B blood and a 25% chance of a baby with type AB blood. That means that they have a 25% chance of having a baby with type A blood. Remember this doesnt account for positive or negaive antibodies.