Probability questions- plz help

Posted by Xiang on May 30, 2013; 5:25pm
URL: http://discussion-forum.276.s1.nabble.com/Probability-questions-plz-help-tp7581507.html

If the probability of having a male child is 0.5 and the probability of having a female child is also .
suppose a family stops when there are 2 male children or when they have 4 kids in  all.
what is the sex ratio of a population with such a family planning?

thanks :)