Let AB, CD, EF, GH, and JK be five diameters of a circle with center at 0. In ho

Let AB, CD, EF, GH, and JK be five diameters of a circle with center at 0. In how many ways can three points be chosen out of A, B, C, D, E, F, G, H, J, K, and 0 so as to form a triangle?

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