Solve the Problem. -Suppose That China's Population Policy Is Modified So That Every

Solve the problem.
-Suppose that China's population policy is modified so that every family could have
children until either a boy is born or two children are born, whichever comes first.
Assuming that every family chooses to have as many children as possible under this
policy, and that boys and girls are equally likely, how many children would be born in a
typical group of 1000 families?