Question

Mary, who has type O blood, is expecting a child with her husband, who has type B blood. Mary's husband's father has type A blood. What is the probability that the child will have type O blood

Answer 1

50/ 50

Explanation:

The father's father blood doesn't really matter since the husband has type B. It's just a 50/50 chance between B and O.

Answer 2

50% is the answer.

Explanation:

All three persons have different blood groups.

Mary has O blood type.

Her husband has B blood type.

Her father in law has A blood type.

As everyone has different blood groups and the child's group depends on parents blood groups so we have 2 options left.

Hence, the probability that the child will have type O blood is =
`(1)/(2)` =50%