Question

assume the probability of having a boy or a girl is the same. what is the probability of have a boy then a girl then another girl

Answer 1

`(1)/(8)`

Explanation:

If the probability of having a boy or a girl is the same, then

the probability of having a boy = a probability of having a girl = 1/2.

Let B denote boy and G denote the girl.

The sample space of having three children is:

BBB, BBG, BGB, GBB, BGG, GBG, GGB, GGG.

The probabilities of each of those events is

`Pr(BBB)=Pr(BBG)=Pr(BGB)=Pr(GBB)=\\ \\=Pr(BGG)=Pr(GBG)=Pr(GGB)=Pr(GGG)=\\ \\=(1)/(2)\cdot (1)/(2)\cdot (1)/(2)=(1)/(8).`