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Question

The maximum number of points of intersection of 4 circles and 4 straight lines is

A
25
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B
50
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C
56
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D
72
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Solution

The correct option is B 50
We have
4 circles
4 straight
In such case there would be 3 types of intersections
line and line
4C2.1=6........(i)
Line and circle
4C.4C1.2=32...(ii)
circle and circle
4C2.2=12...(iii)
So total no of maximum intersection would be
(i)+(ii)+(iii)
=6+32+12
=50

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