**·**2014-05-16 20:50:42

Maximum no. Of triangles will be formed when no 3 points on diff lines are collinear

No. of ways of selecting 3 points =^{3p}C_{3}

No. of ways of selecting 3 points on a single line =3* ^{p}C_{3}

Subtracting them , we will get our answer as (c)

- Anik Chatterjee but consider the case when the 3 points taken on 3 different lines subtend 180 degrees between them? like when they lie on the common normal to the 3 lines?

·0·Reply·2014-05-19 03:30:26