Question

There are 12 points in a plane of which 5 are collinear. The number of triangles is (b) 211 (c) 210 (d) none of these a 200

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Answer 1

Step-by-step explanation:

With collinear points, we cannot make any triangle (as they are in straight line). Here 5 points are collinear. Therefore we need to subtract 5C3 triangles from the above count. This discussion on There are 12 points in a plane of which 5 are collinear.

Answer 2

none ot these the answer is -

1, 8, 35, 110 , 287 , 632 , 1302 , 2400, 4257, and 6956