The number of triangles that can be formed with 10 points as vertices, n of them being collinear, is 110. Then n is

JEE Advanced Mathematics question

The number of triangles that can be formed with 10 points as vertices, of them being collinear, is 110. Then is

Answer: (C)

Out of all trios of points, the trios taken from the collinear points do not form triangles (the

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Question ID VK-108177