12points are in plane 7points are in collinear how much line can be drawn please give me full solution
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12points are in plane 7points are in collinear how much line can be drawn please give me full solution
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so for 12 points
12C2 and out of these 7 are collinear
therefore 7C2 should be subtracted
so
12C2-7C2+1
1 is added because those 7 points make one line
The number of line is 12C2-7C2+1