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Let the ellipse E: x^2 + 9y^2 = 9 inters...

Let the ellipse `E: x^2 + 9y^2 = 9` intersect the positive x- and y-axes at the points A and B respectively. Let the major axis of E be a diameter of the circle C. Let the line passing through A and B meet the circle C at the point P. If the area of the triangle with vertices A, P and the origin O is `m/n`, where m and n are coprime, then `m-n` is equal to

A

18

B

15

C

17

D

16

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