Out of 18 points in as plane, no three are in the same straight line except five points which re collinear. The num,ber of straight lines formed by joining them is (A) 143 (B) 144 (C) 153 (D) none of these

Out of 18 points in a plane, no three are in the same line except five points which are collinear. Find the number of lines that that can be formed joining the point.

There are 18 points in a plane such that no three of them are in the same line except five points which are collinear. The number of triangles formed by these points, is

There are 10 points in a plane,no three of which are in the same straight line excepting 4 ,which ane collinear.Then,number of (A) straight lines formed by joining them is 40 (B) triangles formed by joining them is 116(C) straight lines formed by joining them is 45 (D) triangles formed by joining them is 120

There are 10 points in a plane, out of which 5 are collinear. Find the number of straight lines formed by joining them.

There are 10 points in a plane, no three of which are in the same straight line, except 4 points, which are collinear. Find (i) the number of lines obtained from the pairs of these points, (ii) the number of triangles that can be formed with vertices as these points.

There are 15 points in a plane, no three of which are collinear. Find the number oif triangles formed by joining them.

There are n points in a plane, no 3 of which are collinear and p points are collinear. The number of straight lines by joining them: