How would you use permutations to find the arrangements possible if a line has 2 girls want to stand together?
For N-person line, the answer is
Ii the line is for N persons and two girls have to stand together, count
the two girls as 1 person.
Then, the number of permutations is
For every such arrangement, these two girls can stand in
two ways, one after the other..
So, overall, the number of permutations is