My discussion question is : 

 

How many siblings to you have ? I have 5 Siblings  3 Brother and 2 Sisters. 

What i need to know using the example below is: 

What is the probability of having that many boys and girls on the front end?  showing all your work.

 

Example: 

On this one, think about the following.

With 1 child, the P(boy) = 1/2 and P(girl) = 1/2

With 2 children, you could have BB, BG, GB or GG, so if you have one sibling and you are a female and your sibling is a female the probability is 1/4, but if your parents had one boy and one girl, the probability of that would be 2/4 or 1/2 since both BG and GB work.

For my case, I had two brothers.  That probability would be 1/8 since 8 different combinations exist.  Think about it, you could have

BBB

BBG

BGB

GBB

GGG

GGB

GBG

BGG

Only one of those is 3 boys, so the probability is 1/8

With 4 children, there are 16 different combinations. Why? 2x2x2x2 = 16

Hope this helps.