Checkout JEE MAINS 2022 Question Paper Analysis : Checkout JEE MAINS 2022 Question Paper Analysis :

Out of 10 points in a plane 6 are in a straight line. The number of triangles formed by joining these points are?

1) 100

2) 150

3) 120

4) None of these

Answer: (1) 100

Solution: If all 10 points are collinear, then number of triangles formed = 10C3 = 120

Triangles formed using 6 collinear points = 6C3 = 20

Therefore, required number of triangles = 120 -20 = 100

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