SOLUTION: There Are 10 points in a plane out of which 3 are collinear . Find the number of straight line and triangles ?? :) thank you .

Algebra ->  Permutations -> SOLUTION: There Are 10 points in a plane out of which 3 are collinear . Find the number of straight line and triangles ?? :) thank you .       Log On


   

Question 839017: There Are 10 points in a plane out of which 3 are collinear . Find the number of straight line and triangles ?? :) thank you .
Answer by psbhowmick(878) About Me  (Show Source):
You can put this solution on YOUR website!
No. of straight lines = 10C2 = 45

No. of triangles = 10C3 - 1 (since 3 points are collinear) = 119