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Grade 11Algebra

There are 25 points in a plane , of which 10 are on the same line.Of the rest,no 3 collinear and no 2 are collinear with any of the 1st 10 points.find the number of different straight lines that can be formed by joining these points

 

 

Profile image of Rahul Ramesh
15 Years agoGrade 11
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1 Answer

Profile image of SAGAR SINGH - IIT DELHI
15 Years ago

Dear rahul,

The required number of ways= 25C2- 10C2

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Sagar Singh

B.Tech, IIT Delhi