If 7 points out of 12 are in same st. li...

If 7 points out of 12 are in same st. line the number of triangles formed by them is

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There are n points in a plane , of which no three are collinear expept m which are collinear. Find the number of triangles formed by joining the points.

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There are 10 points in a plane of which 4 are collinear, find the number of triangles that can be formed from these points.

There are 15 points in a plane of which 4 points lie in one stright line and another 5 points lie in another straight line . The two lines are parallel and no three of the remaining 6 points are collinear . Find (a) the number of straight lines and (b) the number of trangles that can be formed by joining the 15 points .

n points are in space ,no three of which are collinear .if the number of straight lines and triangles , with the given points oniy as the vertices ,obtainted by joining them are equal ,find the value of n .

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