Let the boy be B and the girl be G there are six possible outcomes BGG, GBB, GBG, BGB, BBB, and GGG therefore the probability of getting one boy and two girls is also the probability of getting 3 girls is
There are 2 possibilities for EACH child so there are 8 possible outcomes all together and they are: B B B G B B B G B B B G G G G B G G G B G G G B Two girls and 1 boy odds probability = 3/8 (Those are the last 3 listed). All 3 girls probability = 1/8