How would you use permutations to find the arrangements possible if a line has 2 girls want to stand together?

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Answer 1 · 2016-07-27T14:20:56

For N-person line, the answer is $2 X (N - 1)!$ $2 X (N-1)!$ .

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

$(N - 1)!$ $(N-1)!$ .

For every such arrangement, these two girls can stand in

two ways, one after the other..

So, overall, the number of permutations is

$2 X (N - 1)!$ $2 X (N-1)!$