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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

 

 

Rahul Ramesh , 15 Years ago
Grade 11
anser 1 Answers
SAGAR SINGH - IIT DELHI

Dear rahul,

The required number of ways= 25C2- 10C2

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