A girl scout troop with 10 girl scouts and 2 leaders goes on a hike. When the path narrows, they must walk in single file with a leader at the front and a leader at the back. How many ways are there for the entire troop (including the scouts and the leaders) to line up?

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Answer:

There is only one way in which a leader is on front followed by 10 girl scouts and exactly one leader following 10 girl scouts.

Explanation: