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Algebra Level pending

Concentric circles of radii 1,2,3,4,.......,100cm are drawn.The interior of the smallest circle is coloured red and the angular regions are coloured alternately green and red, so that no two adjacent regions are of same colour. Then the total area of the green regions in sq.cm is equal to.

Dont include πin your answer For example if your answer is 78×π then answer it as 78.

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