# How would you use permutations to find the arrangements possible

How would you use permutations to find the arrangements possible if a line has 2 girls want to stand together?
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Step 1
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 $\left(N-1\right)!$.
Step 2
For every such arrangement, these two girls can stand in two ways, one after the other..
So, overall, the number of permutations is $2X\left(N-1\right)!$.