(Solved): The probability that a family has k children is given by pk = (1 2a) /2 (k1) , for k 2 an ...
The probability that a family has k children is given by pk = (1 ? 2a) /2 (k?1) , for k ? 2 and p0 = p1 = a. If a family has two girls, what is the probability that (a) the family has only two children? (b) the family has two girls as well?