Question

The number of circles that can be drawn out of 10 points of which 7 are collinear is

Answer 1

you can draw a circle through any 3 non collinear points

Answer 2

Answer:

85

Step-by-step explanation:

For drawing a circle we need 3 non collinear points.

This can be done in:

3C3 + 3C2 x 7C1 + 3C1 x 7C2 = 1 + 21 + 63 = 85