How many triangles can be formed by joining 6 points lying on a circle ?

How many triangles can be formed by joining the angular points of a decagon ? How many diagonals will it have ?

five points are given on one of two parallel straight lines and ten points are given on the other straight line. How many triangles can be formed by taking these points as vertices of a triangle ?

How many different triangles can be formed by joining the angular point of a decagon .find also the number of diogonal of the decagon

How many different triangles can be formed by joining the angular points of a polygon of n side ?find also the number of diagonals of the polygon .

Two parallel straight lines contains 5 points and 10 points respectively.How many triangles can be formed using these points as the vertices of the triangles?

out of 18 points in a plane no three are in the same straight lines except five points which are collinear how many triangles can be formed by joining them?

Consider the five points comprising the vertices of a square and the intersection point of its diagonals. How many triangles can be formed using these points?

In how many ways can 6 boys form a ring ?