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the number of straight lines that can be formed by joining 20 points of which 4 points are collinear is what.

the number of straight lines that can be formed by joining 20 points of which 4 points are collinear is what.

Grade:12

1 Answers

SHAIK AASIF AHAMED
askIITians Faculty 74 Points
8 years ago
Hello student,
Total number of straight line drawn from 20 points=20C2
From 4 collinear points 1 line can be formed.
Sothe number of straight lines that can be formed by joining 20 points of which 4 points are collinear is
= 20c2-4c2+1=185 lines
Thanks and Regards
Shaik Aasif
askIITians faculty

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