Concentric circles of radii 1, 2, 3, .....100 cm 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 color. The total area of the given regions in sq.cm is equal to
(a) 1000 π
(b) 5050 π
(c) 4950 π
(d) 515 π
