Too much work..

Classical Mechanics Level pending

A clever mosquito is sitting on a rular with positive as well as negative marks. Its initial position is the mark of $$1$$ on the rular. Just for fun it flies then to mark $$-1$$ and from there to mark $$2$$ and from there to mark $$-2$$ and so on till it reaches $$-10$$. What is the magnitude of the total displacement of the mosquito?

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