Collinear points are points that lie on the same line.
a)
To form a line, all we need to do is select any 2 points , and then join them . The number of ways to select any points (out of 10 distinct points) will be 10C2 which is 45.
b)
As all of the points are non-collinear. The number of triangles would have been 10C3 which is 120, because to form a triangle, we need to select any three points.
Calculations:
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Can you please explain the solution clearly?
thanks.
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