Question

a woman is expecting triplets. what is the probability that there are 2 girls and 1 boy? what is the probability that all 3 babies are girls

Answer 1

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 $\frac{1}{6}$
also the probability of getting 3 girls is $\frac{1}{6}$

Answer 2

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