There are 12 distinct points A,B,C...,L,...

There are 12 distinct points A,B,C...,L, in order, on a circle. Lines are drawn passing through each pair of points (i) How many lines are there in total. (ii) How many lines pass through D. (iii) How many triangles are determined by lines. (iv) How many triangles have on vertex C.

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The correct Answer is:

A, B

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