Assuming that giving birth to a boy or a girl is equally likely, and further, that no multiple births have occurred, ?rst, determine the probability of a family having three boys in a row. Now consider the conjecture (based on empirical data) that, for a family that has already had two boys in a row, the probability of having a third boy is 0.8. Under these conditions, what is now the probability of a family having three boys in a row?