How would you use permutations to find the arrangements possible if a line has 4 girls and 4 boys alternating boy girl boy girl?
In fact we are making two lines -- boys and girls, and then intertwine them.
Line of 4 boys:
Line of 4 girls: also
Combination of the two:
If it doesn't matter whether the first is a boy or a girl, we'll have to double that to