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Q.

The are 10 points in a plane of which no three points are collinear but 4-points are concyclic. The number of different circles that can be drawn through at least 3 points of these points is

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a

117

b

120

c

None of these

d

116

answer is C.

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Detailed Solution

A unique circle can be drawn throw three points, hence a selection of three points results in a circles. So, the maximum number of circles using 10 points is 10C3.  Now, out of these 10 points 4 are concyclic, hence 4C3  circles are actually number of circle.

 Required number of circles =10C34C3+1=117.

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