There are 12 points in a plane of which 5 points are collinear, then the number of lines obtained by joining these points in pairs is `""^(12)C_(2) - ""^(5)C_(2)`.

There are 12 points in a plane of which 5 points are collinear, then the number of lines obtained by joining these points in pair is ""^12C_2-""^5C_2+1,

STATEMENT -1 : There are 12 points in a plane of which only 5 are collinear , then the number of straight lines obained by joining these points in pairs is ""^(12)C_(2) - ""^(5)C_(2) . STATEMENT-2: ""^(n +1)C_(r) - ""^(n-1)C_(r - 1) = ""^(n)C_(r) + ""^(n)C_(r - 2) STATEMENT -3 :2n persons may be seated at two round tables , n person seated at each , in ((2n)!)/(n^(2)) in differnet ways.

There are 12 points in a plane of which 5 are collinear . Find the number of straight lines obtained by joining these points in pairs .

There 12 points in a plane of which 5 are collinear . Find the number of straight lines obtained by joining these points in pairs.

There are 10 points in a plane of which 4 are collinear, Find the number of lines obtained from the pairs of these points.

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 12 points in a plane ,5 only of which are collinear . The number of triangles which can be formed by joining the points is

There are 10 points in a plane out of which 5 are collinear. The number of straight lines than can be drawn by joining these points will be