Posted by Tim on .
Can someone tell me if I have the correct answers? I am really confused.
Three boys and three girls line up to go in the front door.
In how many ways can they line up?
My answer: 720
How many ways can they line up if the first one in line is a girl and then alternates by gender, a girl, a boy...
My answer: 3*3*3*2*2*1*1=108
Find the probabiltiy that the first person in line is a girl and the line alternates by gender.
My answer: 1/120

Probability 
bobpursley,
first, 6!, correct
second 3*3*2*2*1*1
third: 24/720*1/2