How many triangles can we form if we draw all the diagonals of a hexagon?
I thought that the answer is $\binom{6}{3}=20$ but this is not the right answer, why?
How many triangles can we form if we draw all the diagonals of a hexagon?
I thought that the answer is $\binom{6}{3}=20$ but this is not the right answer, why?