In a plane 10 straight lines are such that no two of these are parallel and no there of them are concerned.How many triangles can be formed by these lines?

How many types of matrices can be formed from 8 elements ?

How many types of matrices can be formed from 11 elements ?

Two lines parallel to the y-axis and at a distance of2 units from the x-axis are taken. Another two lines parallel to the x-axis and at a distance of 3 units from the y-axis are also taken. Find the distance of the angular points of the rectangle, formed by the four intersecting line segments, from the origin.

How many triangles may be formed by joining any three of nine points on a plane when no three of them are collinear.

How many triangles can be obtained when the vertices of a hexagon are joined?

How many triangles can be obtained by joining the vertices of a quadrilateral?

In how many ways can 5 boys and 3 girls stand in a row such that no two girls are together?

In how many ways can 10 scrips be arranged, so that the best and the worst do not come together?

Draw the graphs of the equations 5x-y=5 and 3x-y=3.Determine the coordinates of the vertices of the triangles formed by these lines and the y-axis.

How many triangles may be formed by joining any three of nine points on a plane when five of them are collinear.