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Consider a circle with unit radius. There are seven adjacent sectors, S1, S2, S3,….S7, in the circle such that their total area is th of the area of the circle. Further, the area of the jth sector is twice that of the (j – 1)th sector, for j = 2,…7. What is the angle, in radians, subtended by the arc of S1 at the centre of the circle?