A couple are planning to have four children. (Assume that it is equally likely for a boy or a girl to be born.)

Question

What is the probability that all four of their children will be girls?

Answer 1

There is a 1/2 probability of having a girl for each child. Since they want all four children to be girls, we have a (1/2) * (1/2) * (1/2) * (1/2) = 1/16 probability of having all four children be girls.