The sample space listing the eight simple events that are possible when a couple has three children is {bbb, bog, bob, bgg, gbb, gbg, ggb, ggg). After identifying the sample space for a couple having four children, find the probability of getting two girls and two boys (in any order). Identify the sample space for a couple having four children. (Use a comma to separate answers as needed.) Find the probability of getting two girls and two boys (in any order). (Type an integer or a decimal. Do not round.)